Detail.ai

All case files

• DD-001 Starry Eyed: Asteroid hyalosis fills the eye's vitreous gel with hundreds of tiny yellow-white spheres ('asteroid bodies') made of calcium, phosphate and lipids. To an eye doctor they glitter like stars in a night sky, but most people who have them never notice. It affects roughly 1 in 100–130 people, becomes far more common with age, is more common in men, and usually affects only one eye. It needs no treatment unless it hides the retina during an exam or, rarely, blurs vision.
• DD-002 Probe IV: Ford's 1983 Probe IV concept car (built with Ghia) had a drag coefficient of about 0.15.
• DD-003 Eukaryotic: Your cells are packed with tiny organs: a tour of the specialized organelles inside every eukaryotic cell.
• DD-004 Atomic Annie: In the Grable test (May 25, 1953, Nevada), the 83-ton M65 Atomic Cannon fired the only nuclear artillery shell in history.
• DD-005 Print Precision: An inkjet printhead fires drops measured in picoliters, trillionths of a liter. Home printers go down to about 1–1.5 pL, and some lab heads go below 1. Thermal ('bubble jet') heads flash-boil a speck of ink so that a vapor bubble kicks a drop out. Piezo heads flex a crystal to squeeze it out. Drops fly at roughly 5–15 m/s, and Epson heads can fire up to 50,000 times a second. The best industrial heads land each drop within about a micron of its target.
• DD-006 CryoBranding: Some horses are branded with -196 °C cold instead of fire, and the hair grows back snow-white in the brand's shape.
• DD-007 Gravity, or Lunavity?: A University of Tokyo team built a 16-fan wearable drone that makes jumping feel like you're on the Moon.
• DD-008 One Roof Town: Most of Whittier, Alaska lives in a single 14-story building, and the only road into town is a tunnel that closes every night.
• DD-009 Vertical Parking II: Giken's ECO Cycle is a robotic bike park buried in a cylinder under the pavement. Above ground there's only a small entrance booth. You push your bike onto a slot and press a button, and a rotating elevator stores it in a ring of racks underground. A standard unit holds about 200 bikes. To get your bike back, you tap an IC card, and it returns in about 13–15 seconds on average. The first unit opened in 1998, and they now sit beside busy stations in Tokyo and other Japanese cities.
• DD-010 Bethlehem Steel: Bethlehem Steel grew out of the Saucona Iron Company, founded in South Bethlehem, Pennsylvania, in 1857. It became Bethlehem Steel Company in 1899 and a corporation in 1904, and was for decades America's second-largest steelmaker. Its wide-flange beams helped make skyscrapers possible. Its steel went into the Golden Gate and George Washington bridges and the Empire State Building. In World War II its shipyards built 1,121 ships, more than any other builder. It went bankrupt in 2001 and was dissolved in 2003.
• DD-011 EKV: Exoatmospheric Kill Vehicle: The Exoatmospheric Kill Vehicle (EKV) is the business end of America's Ground-based Midcourse Defense (GMD) system. A three-stage Ground-Based Interceptor rocket lofts it out of the atmosphere. There it separates, picks out the warhead with a multi-color infrared sensor and its own computers, and steers with divert thrusters into a head-on collision. It carries no explosive warhead. Telling warheads from decoys has always been its hardest problem. A planned replacement kill vehicle was cancelled in 2019, and Lockheed Martin is now building the Next Generation Interceptor.
• DD-012 Quantum Infrastructure: The gold 'chandelier' in photos of quantum computers is really a refrigerator. Superconducting qubits are so easily disturbed that the chip sits on the bottom plate of a dilution refrigerator. Each stage of the fridge is colder than the one above, and the bottom plate is held around 10–15 millikelvin by a mixture of helium-3 and helium-4. That is more than 180 times colder than the 2.7 K of deep space.
• DD-013 Rapid Liquid Printing (RLP): RLP stands for Rapid Liquid Printing, a 3D-printing method developed at MIT's Self-Assembly Lab. Instead of stacking thin layers in air, a nozzle on a robot or CNC machine draws liquid rubber, foam or plastic freely in 3D inside a tank of granular gel. The gel holds the wet material in place until it cures. Then the part is lifted out and rinsed with water. Prints take seconds to minutes rather than hours, and they can be as big as furniture.
• DD-014 Footstep Power: Starting in 2006, JR East tested a 'power-generating floor' at Tokyo Station's ticket gates. Piezoelectric discs inside the floor turn the pressure and vibration of passengers' footsteps into electricity. The best trials made up to about 940 kilowatt-seconds a day. That's only about a quarter of a kilowatt-hour, enough for displays or a ticket gate but not for the station. In 2008 Soundpower tested a similar mat at Shibuya Station that lit a holiday display. The Reel's glowing tiles look like Pavegen's, which work differently: they use electromagnetic generators, not piezo crystals.
• DD-015 The Vault: Vaults are giant, hollow, barrel-shaped particles made of protein and RNA. They're found in the cytoplasm of most eukaryotic cells, with about 10,000 in a typical human cell. Each one is a 12.9-megadalton shell made of 78 copies of the major vault protein, built as two identical 39-protein halves. It also carries smaller partners (VPARP, TEP1 and vault RNA). Nearly 40 years after their discovery in 1986, nobody knows for sure what vaults do.
• DD-016 TeraFab: TeraFab is the AI-chip complex that SpaceX and Tesla plan to build in Grimes County, Texas. It would make, package and test logic and memory chips under one roof. Texas announced the first phase on Aug 6, 2026: more than $16.8 billion, 3,000 jobs and a 100-million-square-foot facility. Tax filings sketch four phases worth up to about $119 billion, but the later phases aren't committed.
• DD-017 Modern Mahjong: Automatic mahjong tables hide a rotating drum under the felt. Players push the used tiles in, and the machine shuffles them, uses magnets to turn each tile face-down, and stacks the four walls. The real trick is that they use two sets of tiles: one is shuffled and stacked inside while the other is in play, so the next hand rises up almost instantly. Fully automatic tables appeared in Japan around 1980, replacing the hand 'washing' and wall-building that went before.
• DD-018 Shrinking Circuits: The first integrated circuits (1958–60) had just one to four transistors. Intel's 4004 microprocessor (1971) had 2,300 on a 12 mm² die built with a 10-micrometer process. Today a single chip such as NVIDIA's GH100 packs 80 billion transistors onto 814 mm², thanks to decades of shrinking features. Even so, modern node names like '5 nm' are generation labels, not literal transistor sizes.
• DD-019 Heavenly Lake: Namtso (Nam Co) in central Tibet sits 4,718 m (15,479 ft) above sea level, almost 3 miles up. It's often called the world's highest saltwater lake. Its Tibetan name means 'heavenly lake', and it's one of Tibet's sacred lakes, with the snow-capped Nyenchen Tanglha range rising along its southern shore.
• DD-020 Cherenkov Glow: Cherenkov radiation is light given off when a charged particle moves through a medium like water faster than light travels in that medium, which in water is about 75% of its vacuum speed. Nothing beats light in a vacuum. The particle's wake of polarized molecules builds into a cone-shaped 'shockwave' of light, much like a sonic boom. In reactor pools, high-energy electrons make the water glow blue. The glow isn't radioactive itself, and inspectors use it to check spent fuel.
• DD-021 Mobile Mortars: A mortar is a light, smoothbore tube that a small crew can carry and set up on a bipod and baseplate. A round dropped down the muzzle hits a fixed firing pin at the bottom, which sets off its propellant charge and throws it out at a steep angle (generally above 45 degrees). That high arc lets mortars hit targets behind hills or cover that the crew can't see.
• DD-022 Ocean-3: Ocean-3 is Panthalassa's series of wave-powered, floating AI computing nodes. Each one is an 85 m plate-steel structure shaped like a golf ball on a tee. As it bobs, seawater is driven up an internal tube to spin a turbine, which powers onboard GPUs. The nodes have no anchor and no power cable. They steer themselves, and they send results to shore by satellite. Pilot units were planned for the northern Pacific in 2026, with commercial deployments targeted for 2027.
• DD-023 WHRGs 2026: The 2nd World Humanoid Robot Games ran Aug 22–26, 2026 at Beijing's National Speed Skating Oval, with 2,056 robots from 666 teams in 16 countries. That's about four times as many robots as the 2025 Games. The rules now required full autonomy in most competitive events, and the job-style 'scenario' events moved into real factories, hotels and model homes.
• DD-024 Marangoni Motion: When surface tension varies across a liquid, the stronger-pulling (higher-tension) region drags the surface toward itself. Fluid then streams from low surface tension to high. This is the Marangoni effect, named after Carlo Marangoni, who published on it in 1865. James Thomson first explained it in 1855 using 'tears of wine'. It's why a drop of soap or alcohol makes water rush away, why wine climbs the glass, and why sulfur traces change the shape of a weld pool. Chip makers use it to dry silicon wafers without spots.
• DD-025 Sending EMALS: Carrier jets don't have room for a runway, so a catapult does the work. A shuttle in the deck hooks the launch bar on the jet's nose gear and drags the plane to flying speed in about two seconds. The Nimitz-class fleet still uses C-13 steam catapults, which push the shuttle with steam-driven pistons. The new Ford class (USS Gerald R. Ford, CVN 78, and the carriers after it) uses EMALS, the Electromagnetic Aircraft Launch System from General Atomics. It replaces the steam with a linear induction motor fed by energy stored in spinning generator rotors.
• DD-026 Cannikin Quake: On November 6, 1971, the Atomic Energy Commission set off Cannikin 5,875 feet beneath Amchitka Island in Alaska's Aleutians. The test proved the W71 warhead for the Spartan anti-ballistic missile. Its yield was officially 'less than five megatons', making it the largest underground nuclear test the United States has ever conducted. It shook the ground like a magnitude-7 earthquake, lifted the land and nearby seafloor, and caused rockfalls. Seismometers worldwide recorded it. Protests against the test launched the group that became Greenpeace.
• DD-027 Water Forest Park: At the north end of Qingshan Lake (Qingshanhu) in Hangzhou's Lin'an District, about 10,000 cypress trees stand with roughly two meters of their trunks underwater. The stand covers about 50,000 square meters, and the trees are pond cypress and bald cypress introduced from North America. Visitors walk boardwalks or paddle kayaks between the trunks. In summer, duckweed turns the water bright 'matcha' green, and in late autumn the needles go red and gold.
• DD-028 The Chronicles of Georgia: On Keeni Hill at the north edge of Tbilisi, above the Tbilisi Sea reservoir, stand 16 bronze-clad pillars 30 to 35 meters tall. Sculptor Zurab Tsereteli began the Chronicle of Georgia (Sakartvelos Matiane) in 1985. Work dragged on through the Soviet collapse until 2003, and the monument was never fully finished. The upper sections show kings, queens and heroes of Georgian history, and the lower sections tell the life of Christ. The hilltop had once been earmarked for a 100-meter statue of Stalin.
• DD-029 Data Centers: Data centers are the buildings where the internet physically lives: racks of servers, storage and network gear, plus the power and cooling plant that keeps them running around the clock. In 2024 they used about 415 TWh of electricity, roughly 1.5% of the world's total, according to the IEA. In the U.S. they used 4.4% in 2023, and that share could reach 6.7–12% by 2028, according to Lawrence Berkeley National Laboratory. AI is the main driver of the growth, and the hottest AI chips now draw more than 1,000 W each, which is pushing operators toward liquid cooling.
• DD-030 The Flock: Flock Safety, an Atlanta company, makes automated license plate reader (ALPR) cameras. Each one snaps still images of passing cars, using infrared at night. Machine learning turns each image into searchable data: the plate, whether full, partial or missing, plus make, color, damage, bumper stickers and roof racks, which Flock calls a 'Vehicle Fingerprint'. It also records time and place. Matches against police hotlists trigger alerts. By the end of August 2026, more than 80% of the 137,000-plus ALPR cameras mapped across the U.S. were Flock's, according to crowdsourced data cited by the Congressional Research Service. That scale, and warrantless searches across agencies, has drawn privacy scrutiny.
• DD-031 The Line: The Line was announced by Crown Prince Mohammed bin Salman in January 2021 as the centerpiece of NEOM in Saudi Arabia's Tabuk Province. It was pitched as two mirrored skyscrapers 500 m tall and 200 m apart, running 170 km from the Red Sea coast into the mountains. The plan promised 9 million residents, no cars or streets, and an underground train covering the full length in 20 minutes. Reality fell far short. Costs ballooned, and the first phase was cut to about 2.4 km. Construction was suspended in September 2025 with only foundation work done, and in May 2026 Semafor reported the project was on hold until after 2030.
• DD-032 Guizhou Solar: Guizhou, in southwest China, is a land of karst peaks. Its thin soils erode easily, leaving bare rock, a problem known as 'rocky desertification'. Since the 2010s the province has covered those barren hills with solar panels. The first gigawatt-scale base, at Guanling, connected its first 1,050 MW phase to the grid on December 29, 2023, on about 20,000 mu (roughly 1,300 hectares) of deeply desertified land. Puding followed with a 600 MW project in 2025. Many sites are 'agrivoltaic': chilies, herbs, taro and vegetables grow in the shade beneath the panels.
• DD-033 Offshore Oil: Offshore oil and gas uses two kinds of structures. Fixed platforms are steel jackets pinned to the seabed with piles, compliant towers, and similar designs that sit over a field for decades. Mobile offshore drilling units (MODUs) move from well to well. Jack-ups stand on legs lowered to the seabed in water up to about 450 ft. Semi-submersibles float on flooded pontoons and are held by anchors or thrusters, and drillships work in 2,000–10,000 ft of water using dynamic positioning. The Reel's own footage shows red-hulled jack-ups bridged to production platforms, a type it never names.
• DD-034 Winter in Harbin: Harbin, the 'Ice City' of China's northeast, began its modern ice festival on January 5, 1985. Its roots go back to a 1963 ice-lantern show and Qing-dynasty lanterns made from blocks of river ice. Each December, workers saw blocks two to three feet thick out of the frozen Songhua River. Sculptors then turn them into palaces, landmark replicas and LED-lit castles. The centerpiece, Harbin Ice and Snow World, opened in 1999, is rebuilt from scratch every year, and holds a Guinness record as the world's largest ice-and-snow theme park.
• DD-035 Tilted Town: At Xenses, a Grupo Xcaret park just south of Playa del Carmen on Mexico's Riviera Maya, 'El Pueblo' (nicknamed the Pueblito al Revés, or Upside-Down Town) is a walk-through tilted-house illusion. It looks like a classic Mexican village, but the whole street sits on a pronounced slope, and the houses, doors and windows are built square to a false horizon instead of true vertical. Your eyes trust the buildings, your inner ear feels the real slope, and the conflict makes you stagger. Psychologists studying 'mystery spots' have found that vision usually wins this tug-of-war over the vestibular sense.
• DD-036 Supersonic Striker: The B-1 began as the Mach 2 B-1A, which was canceled in 1977. It was revived in 1981 as the B-1B, a stealthier and heavier interim bomber, while the B-2 was delayed. Rockwell delivered all 100 B-1Bs between 1985 and 1988, and the type reached initial operating capability on nuclear alert in October 1986. Its wings sweep from 15° (137 ft span) back to 67.5° (79 ft). Top speed is about Mach 1.2. The U.S. dropped the B-1's nuclear mission in 1994, and its nuclear hardware was stripped out by March 2011 under New START, with Russian inspectors verifying it. Today it's a conventional-only bomber, nicknamed the 'Bone'.
• DD-037 Stellar Birth: Stars are born in giant molecular clouds: cold (about 10 to 20 K), dusty clouds made mostly of molecular hydrogen, up to about 300 light-years across, and holding enough gas for anywhere from 10 to 10 million suns. Something has to tip a dense region into collapse, such as a supernova shock wave. Gravity then squeezes a core by a factor of nearly 10^20 in density. The infalling gas heats up into a protostar whose core reaches several million kelvin. A protostar becomes a true star only when its core hits about 10 million K and hydrogen fusion starts. For a sun-like star, the process takes tens of millions of years.
• DD-038 Solar Prominence: A solar prominence is a huge loop of relatively cool, dense plasma (electrically charged hydrogen and helium) hanging in the sun's million-degree corona. Twisted magnetic fields rooted in the photosphere hold it up. Prominences form in about a day and can sit quietly for months, looping hundreds of thousands of miles above the surface. When the magnetic structure becomes unstable, the prominence erupts and usually becomes the bright core of a coronal mass ejection (CME). CMEs can carry billions of tons of material at speeds from under 250 km/s to nearly 3,000 km/s, and the fastest Earth-directed ones arrive in 15 to 18 hours.
• DD-039 Solar Sailing: Light has no mass but does carry momentum. When photons bounce off a mirror-like sail, they push it twice: once when they arrive and again when they reflect. The force (solar radiation pressure) is tiny, so sails have to be huge and spacecraft light. In the vacuum of space, though, the push never stops. Japan's IKAROS first flew a solar sail between planets in 2010. The Planetary Society's LightSail 2 showed a CubeSat could raise its orbit with sunlight, and NASA's ACS3 (launched April 23, 2024) is testing lightweight carbon-fiber booms for an 80 m² sail. By tilting the sail, a craft can speed up, slow down or 'tack' to change its orbit.
• DD-040 Dipping Dipper: The white-throated dipper (Cinclus cinclus) is Britain's only aquatic songbird, and its family, the dippers (Cinclidae), are the only passerines that feed underwater. A dipper walks down a rock into a fast stream, clamps onto the bed with long legs and sharp claws, and uses short, strong wings as flippers to push itself down against the current. Solid bones cut its buoyancy. An oversized preen gland waterproofs about 3,300 feathers, roughly twice a blackbird's count, and nasal flaps keep water out. Its blood carries extra hemoglobin, and its heart rate drops as it dives. It hunts mostly mayfly, stonefly and caddisfly larvae under the stones.
• DD-041 The Caracal's Ear: The caracal, a medium-sized wild cat of Africa, the Middle East and Central Asia, gets its name from the Turkish 'karakulak', meaning 'black ears'. Each tall, black-tufted ear is moved by about 20 muscles in three groups (humans have six), so the two ears can swivel and tilt independently like satellite dishes. Cats in general can turn their outer ears through about 180° and hear high-frequency sounds well beyond human range, including the squeaks and rustles of rodents. Caracals are opportunistic hunters of rodents, birds, hyraxes and even small monkeys. The ear tufts may help funnel sound, but they're most often thought to signal to other caracals.
• DD-042 The White Temple: Wat Rong Khun, the White Temple, stands about 15 km south of Chiang Rai in northern Thailand. In 1997 the Chiang Rai artist Chalermchai Kositpipat set out to rebuild a run-down local temple entirely at his own expense, and he's still building. White plaster stands for the Buddha's purity, and thousands of mirror chips for the Buddha's wisdom. To reach the white ordination hall (ubosot), visitors cross the 'bridge of the cycle of rebirth' over a pit of hundreds of reaching stucco hands representing desire and suffering. Inside, murals mix flames and demons with Neo, Superman and a Terminator. The site survived a 2014 earthquake, and the nine-building plan may not be finished until about 2070.
• DD-043 Death Foam: When highly pathogenic avian influenza or virulent Newcastle disease hits a commercial flock, U.S. policy aims to kill the infected birds on the farm within 24 to 48 hours to stop the virus spreading. Water-based foam was developed for this after the 2004 Delmarva bird flu outbreak, and USDA and the AVMA gave it conditional approval in 2006. Firefighting-style foam is spread over floor-reared birds (broilers, turkeys, ducks) until it blocks their airways, causing physical hypoxia. In trials it killed broilers about as fast as CO2 or faster, with far fewer workers exposed to the virus. The AVMA has never classed it as euthanasia. In its 2026 depopulation guidelines, water-based foam is Tier 2, 'permitted in constrained circumstances', ranked below whole-house gassing and nitrogen-filled high-expansion foam.
• DD-044 Macrophagia: Macrophages ('big eaters') are immune cells found in every tissue. They recognize microbes in two ways: directly, through receptors for microbial surface patterns, or indirectly, through receptors for antibodies and complement proteins that coat a microbe. The cell then wraps its membrane around the target and pinches it off into a phagosome. Over the next steps the phagosome fuses with endosomes and then lysosomes, becoming an acidic phagolysosome (pH as low as about 4.5) filled with digestive enzymes. NADPH oxidase pumps in superoxide, and nitric oxide from the enzyme iNOS can combine with it to form peroxynitrite. Élie Metchnikoff discovered the process in starfish larvae in 1882 and shared the 1908 Nobel Prize for it. Some pathogens, including the tuberculosis bacterium, survive by blocking the process.
• DD-045 Orwellian: George Orwell's ninth and final completed book, Nineteen Eighty-Four, came out from Secker & Warburg in London on June 8, 1949, and in the U.S. five days later. Orwell died seven months after publication. The novel is set in London, chief city of 'Airstrip One', a province of the superstate Oceania, ruled by the Party under its symbolic head, Big Brother. Winston Smith, an Outer Party member, works at the Ministry of Truth, revising back issues of The Times while the originals vanish down 'memory holes' into a furnace. He rebels with Julia and is betrayed by O'Brien of the Inner Party. Under torture he is broken until he loves Big Brother. The Reel's footage comes from Michael Radford's 1984 film, with John Hurt as Winston.
• DD-046 Coffin Homes: Hong Kong's high housing costs have pushed about 220,000 people into roughly 110,000 subdivided units (SDUs). The median SDU in the 2021 census was 11 m², about 6 m² per person. At the extreme are 'coffin' cubicles: wooden, bed-sized compartments in partitioned flats, with a lockable door and little else. They're too low to stand in, and residents share kitchens and toilets. Per square foot, these tiny spaces rent for more than private flats. Hong Kong has regulated 'cage home' bedspace apartments since 1994. A new Basic Housing Units Ordinance, in force from March 1, 2026, sets minimum standards for subdivided flats (at least 8 m², a window and a toilet), but it doesn't cover bedspace or coffin-cubicle housing.
• DD-047 Mandelbulbs: The Mandelbrot set is drawn by repeatedly squaring a complex number and adding a constant, then coloring the points whose values never escape to infinity. Fractal hobbyists spent years looking for a true 3D version. The obstacle is that there's no three-dimensional number system that works like the complex numbers, so there's no canonical 3D Mandelbrot. Rudy Rucker imagined the idea in the 1980s, and Daniel White published a spherical-coordinate formula on Fractal Forums in 2007. In 2009 Paul Nylander raised the power, usually to 8, and the result, the Mandelbulb, showed buds on buds at every zoom level. It's computed by iterating v → vⁿ + c in spherical coordinates and keeping the points whose orbits stay bounded. The power n sets the number of lobes. Mandelbulb interiors appear in Disney's Big Hero 6 (2014) and Annihilation (2018).
• DD-048 XB-70 Valkyrie: North American Aviation designed the B-70 in the late 1950s as a six-engine, delta-winged nuclear bomber that would cruise its whole mission at Mach 3 and about 70,000 feet, too fast and high for the Soviet interceptors of the day. Soviet surface-to-air missiles, which shot down Gary Powers's U-2 in 1960, and the rise of ICBMs undercut that idea, and President Kennedy canceled the bomber in March 1961. Two XB-70A prototypes were completed as research aircraft. AV-1 first flew on September 21, 1964. The aircraft rode its own shock wave for 'compression lift', drooped its wingtips up to 65° at speed, and reached Mach 3.08 and 74,000 ft. On June 8, 1966, AV-2 was lost after an F-104 chase plane collided with it during a GE publicity photo flight. NASA pilot Joe Walker and USAF Maj. Carl Cross were killed. AV-1 flew research missions until 1969 and is now at the National Museum of the U.S. Air Force in Dayton, Ohio.
• DD-049 Dead Pools: Brine pools are lakes on the seafloor: pockets of brine so dense they don't mix with the seawater above, complete with shorelines and even waterfalls. They form where seawater dissolves salt deposits buried under the seabed, such as the layers left when the ancient Gulf of Mexico evaporated, or the evaporites of the Red Sea rift. The best-known example, the Gulf of Mexico's 'Jacuzzi of Despair', lies about 1,000 m down and is about 30 m around. Its brine runs 80 to 110 psu (normal seawater is about 35). It's warm, nearly oxygen-free and charged with methane and hydrogen sulfide. Crabs, isopods and fish that wander in die, and their bodies are preserved along its rim.
• DD-050 Airborne Wind Turbines: The footage shows the helium-filled aerostats of Beijing-based SAWES Energy Technology (Linyi Yunchuan). The S1500 prototype flew at 1,500 m in Hami, Xinjiang, on September 19–23, 2025. The S2000 is a 60 × 40 × 40 m ducted airship of nearly 20,000 m³ carrying 12 turbines. On January 5, 2026, in Yibin, Sichuan, it climbed to 2,000 m in about 30 minutes, generated 385 kWh and fed it into the local grid through its tether, which the company calls a world first. Because wind power rises with the cube of wind speed, steadier high-altitude wind promises more energy from lighter hardware. The S1500's 1.16-tonne generating system compares with more than 10 tonnes for a conventional turbine. The company rates the S2000 at up to 3 MW; that figure is a claim, not yet a measured output.
• DD-051 Static Spray: Powder coating is a 'dry paint'. Polymer resin, curatives, pigments and flow additives are melt-mixed, cooled and ground into a powder as fine as baking flour. In electrostatic spray deposition, the most common method, a spray gun charges the particles and an electric field pulls them onto a grounded part, where the charge holds them until the part goes into a curing oven. At about 325–450 °F (163–232 °C) the powder melts, flows and chemically cross-links into a tough finish. Because there's no solvent, the process virtually eliminates volatile organic compounds (VOCs), and overspray can be recovered for reuse. Grounding matters: the path from the part to ground must stay under one megohm.
• DD-052 Nuclear Fireball: A nuclear detonation heats the weapon's residues to several tens of millions of degrees. Within a millionth of a second they give off X-rays that the surrounding air absorbs within a few feet, forming the incandescent fireball. The fireball's rapid early expansion compresses the air into a blast wave. For a low-altitude fission burst, roughly 50% of the energy goes into blast, 35% into thermal radiation and 15% into nuclear radiation.
• DD-053 Branson: Richard Branson, born July 18, 1950, started a mail-order record business in 1970 and launched the Virgin Records label in 1972. Virgin signed the Sex Pistols in 1977; the Rolling Stones came much later, in November 1991. In March 1992 he sold Virgin Music to Thorn EMI for about $1 billion. Virgin Atlantic flew its first flight on June 22, 1984. He was knighted in 2000 and founded Virgin Galactic in 2004, and on July 11, 2021, he flew to the edge of space on its Unity 22 flight. Forbes estimated his net worth at $2.8 billion on Oct. 17, 2026.
• DD-054 Axisymmetry: Modelers often assume the gas around a black hole looks the same at every angle around the spin axis. Quantities then depend only on distance and polar angle, and a 3D simulation becomes a much cheaper 2D one. The shortcut has known limits. Cowling's anti-dynamo theorem (1933) says an axisymmetric magnetized flow can't regenerate its magnetic field, so 2D simulations lose the turbulence that drives accretion unless an artificial 'sub-grid' dynamo is added. And because infalling gas generally doesn't share the black hole's spin direction, many disks are expected to be tilted. Tilted disks break the symmetry and must be simulated in full 3D. The classic prediction that a thin disk's inner part aligns with the spin (Bardeen–Petterson, 1975) didn't appear in some GRMHD simulations of moderately thick disks.
• DD-055 Danakil Depression: The Danakil Depression in Ethiopia's Afar region lies mostly about 100 m below sea level, reaching around 124 m. It has a mean annual temperature of about 35 °C. The colorful terrain in the Reel's footage is the Dallol hydrothermal field. There, hot, hyperacidic, iron-rich brines rise through a thick salt deposit, and the iron oxidizes into yellow, green and orange crusts.
• DD-056 Crystal Jellies: Aequorea victoria, the crystal jelly, is a hydrozoan (a hydromedusa), not a true jellyfish. It lives from the Bering Sea to Baja California. In light-producing organs around its bell margin, the protein aequorin gives off blue light when it binds calcium, and GFP converts that light to green. Osamu Shimomura isolated both proteins in 1962. GFP later became a key tool in biology and was the subject of the 2008 Nobel Prize in Chemistry.
• DD-057 Smart Plastics: In October 2022, chemists Adrian Rylski and Zachariah Page at the University of Texas at Austin reported in Science a way to make one polymer that is hard in some places and soft in others. They start with a liquid industrial monomer, cis-cyclooctene, and add two ruthenium catalysts. Where blue LED light shines, one catalyst switches on and builds trans-polyoctenamer, a stiff, opaque, semicrystalline plastic. In the dark, the other slowly builds cis-polyoctenamer, a soft, stretchy rubber. Because both regions are the same material, the boundary between them is seamless. The light sets the pattern while the plastic forms; it doesn't switch a finished part back and forth.
• DD-058 Neutron Spin: Neutron stars are the collapsed cores left after massive stars explode as supernovae, an idea Walter Baade and Fritz Zwicky proposed in 1933. As the core shrinks to about the size of a city, conservation of angular momentum makes it spin much faster, like a skater pulling in her arms. Pulsars are neutron stars whose beams of radiation, from near their magnetic poles, sweep past Earth like a lighthouse. Jocelyn Bell and Antony Hewish detected the first one in 1967. Most pulsars turn only a few times a second at most. The ones that spin hundreds of times a second are millisecond pulsars, old neutron stars 'recycled' by matter and angular momentum from a companion star. The record holder, PSR J1748-2446ad, spins 716 times a second.
• DD-059 Hypersonic Missiles: The Congressional Research Service defines hypersonic weapons as maneuvering weapons that fly at Mach 5 or faster, roughly a mile per second. They come in two types: glide vehicles boosted by a rocket, and cruise missiles powered by air-breathing scramjets. Ballistic missile warheads also exceed Mach 5. What sets hypersonic weapons apart is maneuvering and a lower, flatter flight path, which ground radars may not detect until late. CBO concluded they probably wouldn't be more survivable than ballistic missiles with maneuverable warheads unless those faced highly effective long-range defenses. Heat is the main engineering challenge: GAO says surfaces can exceed 2,000 °F, and CBO cites sustained temperatures as high as 3,000 °F. Russia reportedly fielded its first hypersonic weapons in December 2019, and China likely by 2020. The DOD's FY2026 request for hypersonic weapons was $3.9 billion, down from $6.9 billion in FY2025.
• DD-060 Alcubierre Drive: In 1994, physicist Miguel Alcubierre showed that Einstein's general relativity allows a 'warp bubble': spacetime contracts ahead of a ship and expands behind it, so the ship can cover distance faster than light as seen from outside while never locally outrunning light inside its bubble. It is a mathematical solution, not a machine. The geometry requires exotic matter with negative energy density. Quantum physics allows only tiny, fleeting amounts of negative energy, and in 1997 Michael Pfenning and Lawrence Ford estimated that a 100-meter bubble would need far more negative energy than the mass-energy of the visible universe. Later papers have trimmed the estimates and found other problems, including how a crew could ever start or steer the bubble. No warp drive has been built or tested.
• DD-061 Self-Made Modular: Self-reconfigurable modular robots are machines built from many units that can rearrange how they connect, to change shape for new tasks or to repair themselves. The idea of applying a common connector to a whole robot dates to Toshio Fukuda's CEBOT in the late 1980s. About 30 systems had been built by the time of the Wikipedia survey, but demonstrations have topped out around 50 units, and the promised robustness and low cost haven't been shown. The footage isn't one of those systems. It shows GITAI's Lunar Rover and three Inchworm robots with grapple ends building a 5-meter communications tower in a desert simulating the Moon. GITAI and KDDI announced the demo in December 2023 and March 2024. The robots then attached an antenna, connected power and took the tower apart again.
• DD-062 Karp: Alex Karp studied at Haverford College and Stanford Law School, where he met Peter Thiel, and earned a doctorate from Goethe University Frankfurt. Palantir was founded in 2003, and Forbes dates Karp's start to 2004; he has been CEO since. Early funding included an investment from In-Q-Tel, the CIA's venture arm. Its clients include the U.S. Department of Defense, the FBI and foreign police agencies. Palantir went public through a direct listing on the New York Stock Exchange on Sept. 30, 2020. Fortune reported in February 2025 that Karp had sold about $1.88 billion of stock since the start of 2024 under preset trading plans. Forbes estimated his net worth at $19.9 billion on Oct. 17, 2026.
• DD-063 Foreverest: More than 300 people have died in the Everest region in a century of climbing, and more than 200 bodies are thought to remain on the mountain. Above about 8,000 m, the so-called death zone, the air holds roughly a third of the oxygen at sea level, and summit temperatures average about -36 °C in January. Bringing someone down from there takes a large team, bottled oxygen and a short weather window, so many of the dead have stayed where they fell. Since 2019, Nepal-funded clean-up campaigns have started to bring some of them home: in 2024 a team of soldiers and Sherpa climbers recovered four bodies and a skeleton.
• DD-064 Guttation: Guttation, the release of liquid droplets, is common across the fungal kingdom. How much a fungus produces depends heavily on conditions such as the growth medium and temperature, and its biological role is only partly understood. Lab studies have found the droplets carry secondary metabolites and proteins. Penicillium expansum exudates held 20 specialized metabolites, including the mycotoxins patulin and citrinin, and 194 proteins. Droplets from ochratoxin-producing Penicillium strains held up to 11 times more ochratoxin A than the mycelium beneath them. Toxigenic Stachybotrys chartarum (black mold) produced droplets with up to several thousand nanograms of satratoxins per milliliter. Enzymes such as β-glucosidase, catalase and peroxidase have been measured in the exudates of plant-pathogenic fungi.
• DD-065 The Shah: Mohammad Reza Pahlavi was born in Tehran on Oct. 26, 1919. He became shah on Sept. 16, 1941, after British and Soviet forces occupied Iran and his father, Reza Shah, abdicated. In August 1953, during a power struggle with Prime Minister Mohammad Mosaddegh, he briefly fled the country and returned after a coup backed covertly by the United States and Britain. His White Revolution, ratified by referendum in 1963, redistributed land, set up literacy and health corps and extended voting rights to women. Iran's economy grew quickly, but by the 1970s inflation was high and there was little room for political participation. Opposition came from the clergy, secular nationalists and the left. He left Iran on Jan. 16, 1979; the Islamic Republic was declared on April 1, 1979; and he died in Cairo on July 27, 1980.
• DD-066 Nature's Reclamation: The Reel retells a famous thought experiment popularized by journalist Alan Weisman's 2007 book The World Without Us. In his version of New York, the first big change comes underground: about 800 pumps that keep groundwater out of the subway would stop, and tunnels would flood within days. Freeze-thaw cycles would crack pavement for weeds and then trees, corroding steel would undermine streets and buildings over decades, and forest would cover much of the city within a couple of centuries. There is a real-world test case: Pripyat, near Chernobyl, abandoned in 1986, where trees are taking over streets and wildlife is thriving.
• DD-067 Photon Film: In 2020, Edoardo Charbon's AQUA lab at EPFL and Canon unveiled MegaX, the first megapixel camera built from single-photon avalanche diodes (SPADs), pixels sensitive enough to register one photon at a time. It records up to 24,000 frames per second, but it can also open its pixels for gates just nanoseconds long and shift them in steps of picoseconds (trillionths of a second). Repeating a laser pulse and stepping the gate let the team rebuild a laser pulse flying past optics, slowed down hundreds of millions of times. The 'trillion frames per second' figure the Reel uses belongs to other projects: MIT's 2011 femto-photography and Caltech's 2018 T-CUP, which reached 10 trillion frames per second.
• DD-068 Nic Mad: Nicolás Maduro, born Nov. 23, 1962, in Caracas, worked as a bus driver and transit-union representative before entering politics alongside Hugo Chávez. He served in the legislature, as foreign minister from 2006 and as vice president from October 2012. After Chávez died in March 2013, Maduro became interim president and narrowly won an April 2013 special election. He was reelected in 2018, and in 2024 the National Electoral Council declared him the winner of an election that the opposition and several foreign governments disputed. On Jan. 3, 2026, U.S. forces captured Maduro and his wife, Cilia Flores, in Caracas and flew them to New York, where they face federal charges. Both have pleaded not guilty, and Maduro calls the accusations false. Delcy Rodríguez, his former vice president, has led Venezuela as acting president since January 2026. This Reel was posted in November 2025, before those events.
• DD-069 Ellison: Larry Ellison was born in New York City in 1944 and adopted as a baby by relatives in Chicago. He left the University of Illinois and later the University of Chicago without a degree. In 1977 he co-founded Software Development Laboratories with Bob Miner and Ed Oates, colleagues from Ampex, where they had worked on a CIA-funded mass-storage project code-named ORACLE. The company released the first commercial SQL relational database in 1979 and later took the Oracle name. Ellison was CEO from 1977 until September 2014 and is now Oracle's executive chairman and chief technology officer; Clay Magouyrk and Mike Sicilia have been co-CEOs since September 2025. He owns roughly 40% of Oracle, and his fortune moves with its stock: Forbes put it at $167.2 billion on Oct. 17, 2026, after he briefly topped $400 billion in September 2025.
• DD-070 Gas Blasting: Carbon dioxide blasting was conceived around 1924–25 by three southern Illinois coal men, a chemist, an electrical engineer and a mine operator. They wanted a non-explosive way to break coal that would be at least as safe as permissible explosives and produce less fine coal. The Safety Mining Company took over the patents in 1927 under the trade name Cardox. A reusable high-strength steel tube is filled with liquid CO₂ at a charging plant and then placed in a drill hole. An electrically fired chemical heater turns the CO₂ supercritical almost instantly, and a rupture disc bursts at a set pressure, adjustable from about 1,200 to 2,800 bar. Mechanized mining made it rare in coal mines, but it's used again where explosives are restricted: in some coal mines, urban construction, frozen ground and concrete demolition.
• DD-071 Water Table Troubles: When pumping outpaces recharge, groundwater levels fall. The U.S. Geological Survey calls this groundwater depletion; effects include higher pumping costs, worse water quality, shrinking streams and lakes, and land subsidence. A 2024 Nature study of about 170,000 monitoring wells in 1,693 aquifer systems found rapid declines of more than 0.5 m a year to be widespread in the 21st century, especially in dry regions with extensive croplands. Declines had accelerated over four decades in 30% of the regional aquifers where a comparison was possible. The same study documented cases where levels recovered after policy changes, managed aquifer recharge or surface-water diversions. What usually can't be undone is compaction: when clay layers compress, the aquifer permanently loses storage, and the ground sinks.
• DD-072 Piston Pumps: A piston diaphragm (membrane) pump is a reciprocating positive-displacement pump. In most designs a crank-driven piston doesn't push the diaphragm directly: it moves a sealed hydraulic fluid, and that fluid flexes the diaphragm. On the suction stroke the pump chamber expands, the inlet check valve opens and liquid flows in. On the discharge stroke the diaphragm pushes into the chamber, the inlet valve closes and the outlet valve opens. Only the diaphragm, chamber and check valves touch the pumped liquid, so the pumps are used for slurries, acids and shear-sensitive products. Large mining models handle slurries of up to 85% solids at up to 250 °C.
• DD-073 Liquid Lights: A liquid's electrical conductivity depends on how many ions it holds and how fast they move. Perfectly pure water isn't ion-free: it splits slightly into hydrogen and hydroxide ions, about 10⁻⁷ mol/L of each at 25 °C, which gives a theoretical conductivity of 0.055 µS/cm. Water left open to air absorbs carbon dioxide, which raises that to about 1 µS/cm. Strong electrolytes such as table salt, hydrochloric acid and sodium hydroxide split completely into ions and conduct well. Weak ones such as acetic acid and ammonia split only partly and conduct far less. Seawater conducts about a million times better than ultrapure water.
• DD-074 Grass Skiing: Grass skiing was invented in Germany by Josef Kaiser of Geislingen an der Steige; sources date it between 1960 and 1966. It began as summer training for alpine skiers. Grass skis run on tracks of small rollers, about 192 rolls in a typical pair. A European Cup started in 1971 and European Championships in 1976, and the first World Championships were held in 1979 at Bryce Resort in Virginia. The International Grass Ski Federation ran the World Championships until 1985, when the International Ski Federation (FIS) took over the sport and the federation dissolved. The sport is still raced under FIS today, with a World Cup since 2000.
• DD-075 Torque Conversion: A torque converter sits between the engine and an automatic transmission and lets the car idle in gear without stalling. The engine-driven impeller (pump) flings automatic transmission fluid outward into the turbine, which turns the transmission input shaft. The stator sits between them on a one-way clutch. When the turbine is turning much slower than the impeller, as when pulling away from a stop, the stator turns the returning fluid so it helps the impeller instead of fighting it. That multiplies torque by up to about 2.5:1 at stall. As speeds even out, the stator freewheels and the unit acts like a plain fluid coupling. Because constant slip wastes energy as heat, virtually all modern automotive converters add a lock-up clutch that mechanically joins the impeller and turbine at cruise.
• DD-076 Ali Khamenei: Ali Khamenei was born on April 19, 1939, in Mashhad and studied at the seminary in Qom, including under Ruhollah Khomeini. From 1963 he took part in protests against the monarchy and was imprisoned several times. After the 1979 revolution he sat on the Revolutionary Council, served as deputy defense minister and was elected president in 1981, a largely ceremonial post at the time; he was reelected in 1985. When Khomeini died in June 1989, the Assembly of Experts chose Khamenei as leader, and a referendum that July loosened the office's clerical qualifications. He held the post for 37 years. On Feb. 28, 2026, he was killed in the opening U.S.-Israeli strikes of the 2026 war with Iran. The Assembly of Experts named his son Mojtaba Khamenei supreme leader on March 8, 2026.
• DD-077 Chimera: In Greek mythology, the Chimera was a fire-breathing monster from Lycia. Homer's Iliad describes it as a lion in front, a serpent behind and a goat in the middle; later art shows a goat's head rising from its back and a snake for a tail. The hero Bellerophon killed it with the help of the winged horse Pegasus. Today 'chimera' also means any mix of different parts.
• DD-078 Performing Emperor: The Roman emperor Nero, who ruled from 54 to 68 AD, saw himself as an artist and performed publicly as a singer, lyre player and actor, which many in Rome's elite found shameful. During a tour of Greece he competed in the Olympic Games of 67 AD, which were rescheduled for him. He drove a ten-horse chariot, fell and did not finish, but the judges declared him the winner anyway.
• DD-079 The Bermuda Triangle: The Bermuda Triangle, also called the Devil's Triangle, is a loosely defined area of the western North Atlantic roughly bounded by Miami, Bermuda and Puerto Rico. It became famous for stories of ships and aircraft that vanished, often with supernatural explanations. The U.S. Coast Guard does not recognize it as a special hazard, and studies have found that losses there are not more frequent than in other busy waters.
• DD-080 Entanglement: In quantum mechanics, entangled particles share a single quantum state, so measurements on them are correlated no matter how far apart they are. The correlations appear instantly, but they cannot be used to send information faster than light. Albert Einstein, who doubted the idea, called it 'spooky action at a distance.' Experiments have repeatedly confirmed entanglement, work recognized by the 2022 Nobel Prize in Physics.
• DD-081 ArisTutor: Around 343 BC, King Philip II of Macedon hired the philosopher Aristotle to teach his son Alexander, then about 13. Lessons were held at Mieza and covered subjects such as philosophy, ethics, politics, science and literature. Alexander later conquered an empire stretching to India, spreading Greek culture through the Hellenistic world; how much Aristotle shaped his rule is debated.
• DD-082 BioInspired Robots: Bioinspired robotics designs machines that copy how animals move and sense. Engineers have built flapping-wing drones modeled on insects and birds, robots that climb like geckos, and robotic fish that swim with flexible bodies. Copying these designs can make robots more agile and better suited to particular environments.
• DD-083 The Atomic Gun: The Davy Crockett was a U.S. tactical nuclear weapon system of the Cold War: a recoilless rifle that fired the M388 nuclear projectile. Its W54 warhead had a yield of roughly 10 to 20 tons of TNT, tiny for a nuclear weapon. It was deployed with U.S. Army units, including in West Germany, from 1961 until it was withdrawn by 1971.
• DD-084 Tenzing on Top: Tenzing Norgay, a Sherpa mountaineer, and New Zealander Edmund Hillary became the first people confirmed to reach the summit of Mount Everest on May 29, 1953, as part of a British expedition. Tenzing's exact birth date was not recorded; he is usually said to have been born in the Khumbu region of Nepal, though some accounts place his birth in Tibet. He chose to celebrate his birthday on May 29.
• DD-085 Deadliest Tornado in History: The Tri-State Tornado of March 18, 1925, crossed Missouri, Illinois and Indiana and killed 695 people, making it the deadliest tornado in U.S. history. Its track was long recorded as 219 miles, the longest on record; a 2013 reanalysis found at least 174 miles was likely one continuous tornado.
• DD-086 Geodes: Geodes are hollow rocks lined with crystals. They begin as cavities in volcanic or sedimentary rock, such as gas bubbles in lava. Mineral-rich groundwater seeps in and slowly deposits layers of minerals, often quartz, building crystals inward. The color depends on impurities: amethyst is purple because of iron, combined with natural radiation.
• DD-087 Nebula: Nebulae are huge clouds of gas and dust in space. Types include emission nebulae, which glow; reflection nebulae, which scatter starlight; and dark nebulae, which block light behind them. Stars form when dense regions of molecular clouds collapse under gravity into protostars surrounded by disks. Radiation and winds from young, massive stars then shape the surrounding gas and make it glow.
• DD-088 Hummingbird: Hummingbirds, found only in the Americas, combine the highest energy demands in the bird world with the ability to drop their metabolism to about one-fifteenth of normal in nightly torpor. While hovering, their wings beat about 12 to 99 times per second depending on species, and the bee hummingbird, under 2 grams, is the smallest bird.
• DD-089 Event Horizon: A black hole's event horizon is the boundary beyond which nothing, not even light, can escape. Anything that crosses it moves inevitably toward the center, where general relativity predicts a singularity. The horizon results from extreme spacetime curvature caused by mass packed into a small region, and it marks the point of no return.
• DD-090 Fireflies: Fireflies, also called lightning bugs, are beetles that produce light in their abdomens. The light comes from a reaction in which the enzyme luciferase acts on a compound called luciferin. Fireflies mainly use their flashes to attract mates, and different species have distinct flash patterns.
• DD-091 Coronal Mass Ejection: A coronal mass ejection (CME) is a large expulsion of plasma and magnetic field from the Sun's corona. According to NOAA's Space Weather Prediction Center, a CME can eject billions of tons of coronal material carrying an embedded magnetic field. When one reaches Earth it can trigger a geomagnetic storm, which can disrupt radio communication and satellites and push auroras to lower latitudes than usual. Wikipedia gives an average mass of about 1.6 × 10^12 kg, noting that estimates are lower limits. The footage shows solar imagery, Earth's magnetic field, city lights from orbit and auroras, with the presenter.
• DD-092 The Great Pyramid: Built for Khufu around 2600 BC over roughly 26 years, the Great Pyramid was the tallest human-made structure for more than 3,700 years. Papyri found at Wadi al-Jarf record the logistics of moving Tura limestone, and much of the casing was later stripped for building material in Cairo after earthquakes.
• DD-093 Rosalind: Rosalind Franklin (1920-1958) was a British chemist and X-ray crystallographer. She worked on the structures of DNA, RNA, viruses, coal and graphite. Photo 51, an X-ray diffraction image of DNA taken in 1952 in her lab at King's College London by her PhD student Raymond Gosling, was shown to James Watson without her knowledge. Together with her data, it was key evidence for the double-helix model Watson and Francis Crick published in 1953. Watson, Crick and Maurice Wilkins shared the 1962 Nobel Prize in Physiology or Medicine. Franklin had died in 1958, and the prize isn't awarded posthumously. The footage shows portraits and lab scenes, with the presenter.
• DD-094 Hanging Gardens: The Hanging Gardens of Babylon are the only one of the Seven Wonders of the Ancient World whose location has never been established. Classical Greek and Roman writers describe terraced gardens and credit them to Nebuchadnezzar II, who reigned c. 605-562 BC and was said to have built them for his wife, Amytis. No Babylonian text mentions them, and excavations at Babylon haven't found definitive evidence. One theory, argued by Stephanie Dalley, places them at Nineveh, the Assyrian capital, built under Sennacherib. Others think they may be legendary. The footage shows renderings of terraced gardens and Babylonian scenes, with the presenter. This is No. 2 in his Seven Wonders of the Ancient World series.
• DD-095 Ada All-Time: Ada Lovelace (1815-1852) was an English mathematician who worked with Charles Babbage on his proposed Analytical Engine, a mechanical general-purpose computer. In 1843 she translated an article by Luigi Menabrea about the engine from French and added her own notes, which were longer than the article. Note G sets out an algorithm for computing Bernoulli numbers on the engine, often called the first published computer program. She also suggested the machine could act on things other than numbers, such as music. Historians debate how much credit belongs to her versus Babbage. The engine was never built. The footage shows portraits of Lovelace and Babbage, with the presenter.
• DD-096 Zeus @ Olympia: The Statue of Zeus at Olympia was a giant seated figure, about 12.4 m tall, made by the Greek sculptor Phidias around 435 BC for the Temple of Zeus at Olympia. It was chryselephantine: ivory plates for the flesh and gold for the robes, over a wooden framework, and it sat on an ornate throne. It was lost in the 5th century AD. One tradition says it was taken to Constantinople and destroyed in the fire of the Palace of Lausus in 475 AD. Another says it perished with the temple, which was badly damaged by fire in 425 AD. The footage shows renderings of the statue, the temple and a fire. This is No. 3 in his Seven Wonders of the Ancient World series.
• DD-097 PoisOrVen?: Poison and venom are both toxins, but they're delivered differently. Venom is injected through a bite, sting or spine, as when a snake uses its fangs. A poison works when it's eaten, inhaled or absorbed, for example through the skin. Poison dart frogs (family Dendrobatidae) are poisonous: their skin secretes alkaloid toxins that can harm a predator that touches or eats them. Wild frogs build those toxins from their diet. The footage shows warning symbols, a snake bite demonstration on a hand, snakes and poison dart frogs, with the presenter.
• DD-098 Temple of Artemis: The Temple of Artemis at Ephesus, near modern Selçuk in Turkey, was rebuilt several times. The great marble temple funded in part by Croesus of Lydia, begun around 550 BC, was burned by the arsonist Herostratus in 356 BC. A larger replacement followed, and that later temple is the one counted among the Seven Wonders. Pliny the Elder gave it 127 columns, each 60 feet high. It was plundered by the Goths in 262 AD and finally destroyed in 401 AD. One reconstructed column stands at the site today. The footage shows renderings of columns, statues and a fire. This is No. 4 in his Seven Wonders of the Ancient World series.
• DD-099 Cleo: Cleopatra VII (69-30 BC) was the last active ruler of the Ptolemaic Kingdom of Egypt. Her dynasty descended from Ptolemy I, a Macedonian Greek general, and her first language was Koine Greek. She is the first Ptolemaic ruler known to have learned Egyptian. Plutarch implies she also spoke Ethiopian, the language of the 'Troglodytes', Hebrew (or Aramaic), Arabic, Syrian, Median and Parthian, and Wikipedia notes she could apparently also speak Latin. She formed alliances with Julius Caesar and later Mark Antony, and after her death in 30 BC Egypt became a Roman province. The footage shows AI-style portraits and court scenes, with the presenter.
• DD-100 Mausoleum at Halicarnassus: The Mausoleum at Halicarnassus (modern Bodrum, Turkey) was a tomb about 45 m high, completed around 351 BC. It was built for Mausolus, a satrap of Caria under the Persian Achaemenid Empire, and his sister-wife Artemisia II, who oversaw the work after his death. Its architects were Satyros and Pythius of Priene, and its sculpture is credited to leading Greek sculptors. It was so famous that 'mausoleum' became the general word for a grand tomb. A series of earthquakes between the 12th century and 1402 wrecked it, and the Knights of St John reused its stones; demolition was complete by 1494. The footage shows renderings of the tomb and its ruins, with the presenter. This is No. 5 in his Seven Wonders of the Ancient World series.
• DD-101 Lucky Stripe: Why zebras are striped has been debated since Darwin and Wallace. The best-supported explanation today is protection against biting flies such as horse flies (tabanids), which spread disease. In a 2019 PLOS ONE study, Tim Caro and colleagues filmed flies around zebras and horses in the UK and found flies approached zebras but failed to slow down and land as often as on horses; horses wearing striped coats also got fewer landings. Other ideas, such as camouflage, social signaling and heat control, have weaker support. The footage shows zebras grazing and close-ups of flies.
• DD-102 Colossus of Rhodes: The Colossus of Rhodes was a bronze statue of the sun god Helios, about 33 m (108 ft) tall, built by Chares of Lindos to celebrate Rhodes surviving a siege in 305-304 BC. Completed around 280 BC, it was made of bronze plates over an iron framework. An earthquake in 226 BC snapped it at the knees, and it lay where it fell for centuries; Pliny the Elder reported that even fallen it was a marvel. In 653 AD an Arab force under Muawiya took Rhodes and, by later accounts, sold the remains for scrap. The famous image of the statue straddling the harbor entrance is a medieval idea; modern scholars think it stood on land, as ships could not have passed under it and the harbor would have been blocked during construction. The footage shows renderings of the statue and harbor. This is No. 6 in his Seven Wonders of the Ancient World series.
• DD-103 Last of Ants: Ophiocordyceps unilateralis is a parasitic fungus, now treated as a species complex, that infects carpenter ants in tropical forests. An infected ant leaves its colony, climbs vegetation and bites down on a leaf vein in a 'death grip', usually at a height and humidity that suit the fungus. The fungus then kills the ant, grows a stalk from the back of its head and releases spores onto ants foraging below. Research led by David Hughes found the fungus spreads through the ant's body and muscles, while the brain largely stays free of fungal cells, so the control seems to work through the muscles and chemistry rather than by occupying the brain. The fungus is popularly known as the 'zombie-ant fungus'. The footage shows infected ants and fungal growth.
• DD-104 Lighthouse of Alexandria: The Lighthouse of Alexandria, often called the Pharos, was built on the island of Pharos at Alexandria during the reign of Ptolemy II, completed around 280 BC. Estimates put its height above 100 m (330 ft), making it one of the tallest human-made structures for centuries. A fire at the top, reflected by a mirror according to later accounts, guided ships into the harbor. Three earthquakes between 956 and 1303 AD badly damaged it and it became a ruin; in 1480 the Citadel of Qaitbay was built on its site using some of its stone. Its name lives on in the word for lighthouse in several languages, such as French phare. The footage shows renderings of the lighthouse and harbor. This is No. 7 in his Seven Wonders of the Ancient World series.
• DD-105 The Red Forest: The Red Forest is the roughly 10 km² (4 sq mi) area of woodland around the Chernobyl Nuclear Power Plant in the Exclusion Zone, in Polesia in The Ukraine. After reactor 4 exploded on April 26, 1986, the pine trees there absorbed very high doses of radiation and died, turning a ginger-brown color that gave the forest its name. During the cleanup the dead trees were bulldozed and buried in trenches. The area remains among the most contaminated in the zone, and wildfires there have raised concern about radioactive smoke. The footage shows the plant and red-tinted forest imagery.
• DD-106 Quasi-Stellar: A quasar is an extremely luminous active galactic nucleus: a supermassive black hole at the center of a galaxy surrounded by a gaseous accretion disk. As gas falls toward the black hole it heats up and releases enormous energy across the electromagnetic spectrum, often outshining the host galaxy. The name comes from 'quasi-stellar radio source', because the first ones found in the 1950s and 60s looked like faint stars. Maarten Schmidt identified the redshift of quasar 3C 273 in 1963, showing quasars are very distant. The footage shows renderings of galaxies, accretion disks and black holes.
• DD-107 Martha: Martha Dandridge Custis Washington (1731-1802) was the wife of George Washington and the first first lady of the United States. Her biography on Wikipedia notes she took to riding as a girl, once riding her horse up and down the stairs of her uncle's house. During the Revolutionary War she traveled to the Continental Army's winter encampments each year of the war, supporting the officers and troops, according to George Washington's Mount Vernon. Her first husband, Daniel Parke Custis, died in 1757, and she married Washington in 1759. The footage shows AI-style portraits and riding scenes, with the presenter.
• DD-108 Jack: Jack the Ripper is the name given to an unidentified serial killer active in and around the Whitechapel district of London in 1888. Five victims, Mary Ann Nichols, Annie Chapman, Elizabeth Stride, Catherine Eddowes and Mary Jane Kelly, are known as the 'canonical five'; they were killed between 31 August and 9 November 1888. Police investigated eleven Whitechapel murders between 1888 and 1891, but not all are linked to the same killer. Several canonical victims had organs removed, which led some at the time to suggest the killer had anatomical knowledge. The killer was never identified, and many suspects have been proposed since. The footage shows dark AI-style renderings of Victorian London and a figure in a top hat.
• DD-109 Now You Know Rocket League: In this talking-head Reel I talk about my own history with Rocket League: playing since undergrad, an estimated 6,000 hours, and why its learning curve hooked me. Every movement is manual, unlike sports games where players move on their own. Rocket League is a vehicular soccer game developed and published by Psyonix, released in July 2015 for PlayStation 4 and Windows, and later on Xbox One and Nintendo Switch. Epic Games bought Psyonix in 2019, and the game went free-to-play in September 2020. Gameplay clips play under the talking-head section.
• DD-110 Now You Know Anime: In this Reel the presenter, speaking to camera, runs through favorite Japanese animated series: Naruto, about an outcast ninja who dreams of leading his village; One Punch Man, about a hero who defeats any enemy with one punch; Death Note, about a student with a notebook that kills; Hunter x Hunter, whose manga has gone on repeated long hiatuses; and Jujutsu Kaisen, known for its fight animation. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-111 The Great Wall: The Great Wall of China is a series of fortifications built across northern China over roughly two millennia, from the 7th century BC through the Ming dynasty, to guard against raids from the steppe. After unifying China in 221 BC, Qin Shi Huang connected and extended earlier walls. Much of what stands today dates from the Ming (1368-1644). Builders included soldiers, conscripted peasants and convicts. A 2012 survey by China's State Administration of Cultural Heritage measured all its branches at about 21,196 km. UNESCO listed it as a World Heritage Site in 1987, and it was named one of the New 7 Wonders of the World in 2007. The footage shows renderings of the wall, workers and Qin Shi Huang, with the presenter. This is No. 1 in his Seven Wonders of the New World series.
• DD-112 Tigers: Tigers (Panthera tigris) have stripe patterns unique to each animal, so researchers can identify individuals from photographs. Camera-trap surveys use this to estimate how many tigers live in an area and to track them over time, which is central to conservation. The stripes, which run onto the skin, are thought to help break up the cat's outline in tall grass and forest. The footage shows tigers in the wild, with the presenter.
• DD-113 Plasma: Plasma is often called the fourth state of matter, after solid, liquid and gas. It forms when a gas is energized enough, by heat or a strong electric field, that electrons are stripped from atoms, leaving a mix of free electrons and positive ions. Because it contains free charges, plasma conducts electricity and responds strongly to magnetic fields. It makes up most of the ordinary visible matter in the universe, including stars like the Sun. On Earth it appears in lightning, auroras, neon and fluorescent lights, and some flames. Plasma physics underpins fusion research and industrial uses such as chip etching. The footage shows plasma balls, lightning, lamps and flames.
• DD-114 Petra: Petra, in southern Jordan, was the capital of the Nabataean kingdom, known for its rock-cut facades and water-conduit system. It remained known to local Bedouin, but was largely unknown to Europeans after the Crusades. In 1812 the Swiss explorer Johann Ludwig Burckhardt, traveling as 'Sheikh Ibrahim ibn Abdallah', persuaded a guide to take him there on the pretext of sacrificing a goat at the tomb of Aaron nearby. UNESCO listed Petra as a World Heritage Site in 1985, and it was named one of the New 7 Wonders of the World in 2007. It's Jordan's most visited tourist attraction. The footage shows renderings of Petra's facades and Burckhardt, with the presenter. This is No. 2 in his Seven Wonders of the New World series.
• DD-115 Emperor Penguins: Emperor penguins (Aptenodytes forsteri) breed during the Antarctic winter, when temperatures can fall below -40 °C, which is also -40 °F. The female lays a single egg and passes it to the male, then heads to sea to feed. The male balances the egg on his feet under a fold of skin, the brood pouch, for about two months, huddling with other males against winds of up to 200 km/h. It's the only penguin species where the male alone incubates. By the time the egg hatches he will have fasted for around 120 days since arriving at the colony. The female returns to take over the chick. The footage shows emperor penguins, eggs and chicks on the ice.
• DD-116 Christ the Redeemer: Christ the Redeemer is an Art Deco statue of Jesus Christ on Corcovado mountain in Rio de Janeiro, Brazil. It was designed by French sculptor Paul Landowski and Brazilian engineer Heitor da Silva Costa, with French engineer Albert Caquot; Romanian sculptor Gheorghe Leonida sculpted the face. Built of reinforced concrete with a soapstone skin, it was constructed between 1922 and 1931 and dedicated on October 12, 1931. It stands 30 m (98 ft) tall, excluding its 8 m (26 ft) pedestal, with arms 28 m (92 ft) wide. It was named one of the New 7 Wonders of the World on July 7, 2007. The footage shows the statue, Rio and portraits, with the presenter. This is No. 3 in his Seven Wonders of the New World series.
• DD-117 Blackbird: The Lockheed SR-71 'Blackbird' is a retired long-range, high-altitude, Mach 3+ strategic reconnaissance aircraft developed in the 1960s by Lockheed's Skunk Works from the earlier A-12. It first flew in 1964 and was operated by the US Air Force. Its standard tactic against surface-to-air missiles was to accelerate and outrun them, and no SR-71 was lost to enemy fire. It set the absolute speed record for an air-breathing crewed aircraft, 3,529.6 km/h (2,193.2 mph), in 1976, which still stands. The Air Force retired it in 1998 and NASA flew its last in 1999. The footage shows SR-71s in flight and on the ground, with the presenter.
• DD-118 Machu Picchu: Machu Picchu is a 15th-century Inca citadel on a mountain ridge above the Urubamba valley in Peru. Most archaeologists think it was built as an estate for the Inca emperor Pachacuti, around 1450. It was abandoned about a century later, around the time of the Spanish conquest, and there's no record of the Spanish ever reaching it. Local farmers knew the site; the American historian Hiram Bingham brought it to international attention in 1911. UNESCO listed it as a World Heritage Site in 1983, and it was named one of the New 7 Wonders of the World in 2007. The footage shows Machu Picchu and Inca-style portraits, with the presenter. This is No. 4 in his Seven Wonders of the New World series.
• DD-119 Polar: Polar bears (Ursus maritimus) are strong swimmers and are classed as marine mammals because they spend much of their lives on sea ice and in the sea. Their name means 'maritime bear'. They hunt mainly seals from the ice and can swim long distances between floes, paddling with their large front paws. As sea ice shrinks, some bears have been tracked making very long swims. The footage shows polar bears on ice and in water, with the presenter.
• DD-120 Chichen Itza: Chichen Itza is a large pre-Columbian Maya city on Mexico's Yucatán Peninsula and a UNESCO World Heritage Site since 1988. Its central pyramid, the Temple of Kukulcán, also called El Castillo, has a stairway on each side. Around the spring and autumn equinoxes, the late-afternoon sun casts triangles of light and shadow from the pyramid's stepped corner onto the northern stairway's balustrade, which ends in carved serpent heads; the effect looks like a serpent descending. Chichen Itza was among the New 7 Wonders of the World announced on July 7, 2007, in a popular vote run by the New7Wonders Foundation. The footage shows the pyramid, the serpent heads and the presenter.
• DD-121 The Colosseum: The Colosseum (Flavian Amphitheatre) in Rome was completed in AD 80 under Emperor Titus and could hold tens of thousands of spectators for gladiator fights and animal hunts. It had a velarium, a retractable awning of canvas or sailcloth that could shade much of the seating. It was hung from ropes and masts set in brackets around the top of the outer wall; sailors specially enlisted from the Roman naval headquarters at Misenum and housed nearby worked it. Historians debate how it was rigged. The Colosseum is part of the Historic Centre of Rome World Heritage Site and was named one of the New 7 Wonders in 2007. The footage shows a reconstruction of the arena and its seating, with the presenter.
• DD-122 Starfish: Sea stars, often called starfish, are echinoderms, related to sea urchins and sand dollars, not fish. Many can regrow lost arms, a process that can take months to a year or more. Because most of their vital organs extend into the arms, some species can regenerate a whole new animal from a single severed arm, as long as it keeps part of the central disc; a few, such as some Linckia species, can do it from an arm alone. Some also reproduce asexually by splitting. The footage shows sea stars on the seabed and close-ups of their tube feet.
• DD-123 Taj Mahal: The Taj Mahal in Agra, India, is a white marble mausoleum that Mughal emperor Shah Jahan built for his wife Mumtaz Mahal; construction ran from about 1631 to 1653. Its polished white marble reflects the color of the light falling on it, so visitors often describe it as pinkish at dawn, bright white or golden by day and soft or silvery by moonlight. It's been a UNESCO World Heritage Site since 1983 and was named one of the New 7 Wonders in 2007. The footage shows the Taj Mahal and its gardens at different times of day, with the presenter.
• DD-124 Eagles: Eagles have large eyes with densely packed photoreceptors and deep foveae, which let them resolve fine detail at a distance. Behavioral studies show some large-eyed raptors, such as the wedge-tailed eagle, have about twice the spatial resolution of humans; the popular '4 to 8 times' figures don't match those measurements. Their forward-facing eyes also give a useful field of binocular vision for judging distance when striking prey. The footage shows a bald eagle perched and swooping over water, with the presenter.
• DD-125 Pluto: Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory, and it was counted as the ninth planet until August 24, 2006, when the International Astronomical Union defined 'planet' in a way that made Pluto a dwarf planet. NASA's New Horizons flew past in July 2015 and photographed a bright, heart-shaped region named Tombaugh Regio after its discoverer. The heart's western lobe, Sputnik Planitia, is a vast basin of nitrogen, carbon monoxide and methane ices; the eastern lobe is uplands coated with nitrogen ice. The footage shows New Horizons images of Pluto, the observatory dome and icy terrain, with the presenter.
• DD-126 Neptune: Neptune, the eighth planet, has the strongest sustained winds measured on any planet in the solar system, up to about 2,100 km/h (around 1,300 mph). When Voyager 2 flew past in 1989, it photographed a huge storm in the southern hemisphere, the Great Dark Spot, comparable in scale to Jupiter's Great Red Spot. Unlike Jupiter's long-lived storm, Neptune's dark spots aren't permanent; later Hubble images showed that spot gone and new ones forming. Bright, high clouds of methane ice also streak across the planet. The footage shows Voyager-style images of Neptune and clouds, with the presenter.
• DD-127 Uranus: Uranus, the seventh planet from the Sun, is an ice giant whose rotation axis is tilted about 98 degrees (97.77°) relative to its orbit, so it essentially spins on its side. Over its 84-year orbit, each pole spends about 42 years in sunlight and then 42 years in darkness, giving it the most extreme seasons of any planet. The cause of the tilt isn't settled; a leading idea is one or more giant impacts early in the solar system's history. Voyager 2 is the only spacecraft to have visited, flying past in 1986. The footage shows renderings of Uranus and its rings, with the presenter.
• DD-128 Saturn: The Cassini Division is a roughly 4,800 km wide region between Saturn's A and B rings, discovered by Giovanni Domenico Cassini in 1675. It looks empty from Earth but contains thinner, sparser ring material. It's largely cleared by a 2:1 orbital resonance with the moon Mimas. NASA's Cassini spacecraft orbited Saturn from 2004 until it was deliberately plunged into the planet in 2017, studying the rings in detail. The footage shows renderings of Saturn and its rings, with the presenter.
• DD-129 Jupiter: The Great Red Spot is a giant anticyclone in Jupiter's southern hemisphere, wider than Earth though it has been shrinking. It has been observed continuously since 1878, with records back to 1831. A similar spot was seen from 1665 to 1713; if it was the same storm, it would be over 350 years old, but a 2024 study suggested it wasn't. Jupiter also has the strongest planetary magnetic field in the solar system, which traps intense radiation belts that spacecraft must be shielded against. The footage shows renderings and images of Jupiter, with the presenter.
• DD-130 Mars: Olympus Mons on Mars is a huge shield volcano, among the tallest known in the solar system. Its summit stands about 21.9 km (72,000 ft) above the Martian datum, roughly 2.5 times Mount Everest's height above sea level, and it's about 600 km wide. It formed through long-lived eruptions of fluid lava. Mars's low gravity and lack of plate tectonics let lava pile up over one hotspot. Some lava flows are geologically young, so it may not be entirely extinct. The footage shows renderings of Mars and Olympus Mons, with the presenter.
• DD-131 Earth: Earth is not a perfect sphere but an oblate spheroid: its rotation flattens it at the poles and makes it bulge at the equator. The equatorial diameter is about 43 km greater than the polar diameter. Because of the bulge, the point on Earth's surface farthest from its center is the summit of Chimborazo in Ecuador, not Everest. The footage shows Earth from space, with the presenter.
• DD-132 Venus: Venus rotates in the opposite direction to most planets, a retrograde rotation, so the Sun would rise in the west. It is also the slowest-spinning major planet: one rotation relative to the stars (a sidereal day) takes about 243 Earth days, longer than its 225-day orbit around the Sun. Because of the combined motions, a solar day on Venus, sunrise to sunrise, lasts about 117 Earth days. The cause of the retrograde spin is unsettled; ideas include a giant impact and tidal effects of its thick atmosphere. The footage shows images of Venus, with the presenter.
• DD-133 Mercury: Mercury, the closest planet to the Sun, has almost no atmosphere (only a thin exosphere) to trap heat. Its daytime surface reaches about 430 °C (800 °F), hot enough to melt lead, while nights fall to about -180 °C (-290 °F). That is the largest day-night swing of any planet. Its slow rotation also stretches each day: a solar day lasts about 176 Earth days. Despite the heat, radar and the MESSENGER spacecraft found water ice in permanently shadowed craters near the poles. The footage shows images of Mercury and the Sun, with the presenter.
• DD-134 Kings of the Jungle: Lions (Panthera leo) are the most social wild cats, living in prides of related females, their cubs and a coalition of one or more adult males. Females do most of the hunting, often cooperatively, while males defend the pride's territory. Lionesses in a pride often give birth around the same time and nurse cubs communally. Despite the nickname 'king of the jungle', lions mostly live in savanna and grassland, not jungle. The footage shows lions resting and hunting, with the presenter.
• DD-135 Graceful Giants: Giraffes (Giraffa) have seven cervical vertebrae, the same number as almost all mammals, including humans; each is greatly elongated. Their patchy coat patterns differ between individuals, so researchers can identify giraffes from photographs, and pattern traits are partly inherited from the mother. The footage shows giraffes in the wild, with the presenter.
• DD-136 Fast Cats: The cheetah (Acinonyx jubatus) is the fastest land animal, reaching about 93-104 km/h (58-65 mph) in short sprints, and it accelerates quickly. It hunts in brief chases rather than long pursuits. Black 'tear marks' run from the inner corner of each eye down to the mouth; they're thought to reduce glare from the sun and help the cat focus on prey, working like a football player's eye black. The footage shows cheetahs running and close-ups of their faces, with the presenter.
• DD-137 River Roamers: Hippopotamuses (Hippopotamus amphibius) secrete a red-to-orange fluid sometimes called 'blood sweat'. It's neither: it contains pigments, hipposudoric and norhipposudoric acid, that absorb UV light and may inhibit bacteria. Hippos spend the day in water but can't actually swim or float well; they walk or bounce along the bottom and can stay submerged for around five minutes. On land they can run in short bursts at about 30 km/h. They are among the most dangerous large animals in Africa. The footage shows hippos in rivers and on land, with the presenter.
• DD-138 African Gazelles: The impala (Aepyceros melampus) is a medium-sized antelope of eastern and southern Africa. It has a reddish-brown coat, and only males carry the lyre-shaped horns. Females and young form herds, and males compete for territories in the breeding season. Impalas are famous leapers, jumping up to about 3 m high and 10 m long, and they snort to warn of predators. They both graze and browse. Though often called gazelles, impalas belong to their own tribe, Aepycerotini, not the gazelle genus. The footage shows impalas running and leaping, with the presenter.
• DD-139 Suricata Suricatta: The meerkat (Suricata suricatta) is a small mongoose of southern Africa's arid regions. Meerkats live in groups called mobs, gangs or clans, typically of 20 to 30 members and up to about 50. While the group forages, one or more sentinels watch from a raised spot and give alarm calls that vary with the type and urgency of the threat. Group members also share babysitting and teach pups to handle prey. The footage shows meerkats standing guard and foraging, with the presenter.
• DD-140 Elephants: Elephants are the largest living land animals, with three living species: the African bush elephant, the African forest elephant and the Asian elephant. Females and young live in close family herds led by an older matriarch, whose experience helps the group find water and avoid danger. A 2006 study found that one of three Asian elephants tested passed the mirror self-recognition test. Researchers have also documented elephants lingering at and touching the remains of dead elephants. Elephants communicate with calls, touch and body language, including infrasonic rumbles below the range of human hearing that can carry for kilometers. The footage shows elephants in the wild, with the presenter.
• DD-141 Scaly Anteaters: Pangolins are mammals of the order Pholidota, covered in overlapping scales made of keratin. There are eight living species, four in Africa and four in Asia. They are mostly nocturnal and use strong claws to dig into ant and termite nests, catching insects with a long, sticky tongue; they have no teeth. When threatened, a pangolin curls into a tight ball protected by its scales. Pangolins are widely reported as among the most trafficked mammals in the world, hunted for their meat and scales, and all eight species were listed on CITES Appendix I in 2016, banning international commercial trade. The footage shows pangolins foraging and curling up, with the presenter.
• DD-142 Rhinos: There are five living rhinoceros species: white and black in Africa, and Indian (greater one-horned), Javan and Sumatran in Asia. The white rhino is one of the largest land mammals after elephants and has two subspecies, the southern white rhino and the northern white rhino, of which only two females are known to survive. Rhino skin is thick, about 1.5 to 5 cm. Their horns are made of keratin; African and Sumatran rhinos have two horns, while Indian and Javan rhinos have one. Poaching for horn and habitat loss are the main threats, and the Javan, Sumatran and black rhinos are listed as critically endangered. The footage shows rhinos in grassland and forest, with the presenter.
• DD-143 Jellies: Jellyfish are the free-swimming medusa stage of certain cnidarians. They move by contracting their bell-shaped bodies, which pushes water out and drives them forward; many species also gain efficiency from vortices formed as the bell relaxes. Jellyfish have no brain, heart or bones, and they're about 95% water. Fossils show jellyfish-like animals at least 500 million years ago, including Burgessomedusa from the Burgess Shale, about 505 million years old, described in 2023. The footage shows jellyfish drifting in blue water, with the presenter.
• DD-144 Humpback Whales: The humpback whale (Megaptera novaeangliae) is a baleen whale known for its songs, which are sung by males. A song is built from repeated themes, usually lasting about 10 to 20 minutes, and males may repeat it for hours. All males in a population sing roughly the same song, which changes over time. A 2011 study found new songs spreading eastward across South Pacific populations over several years, an example researchers describe as cultural transmission. The footage shows humpback whales swimming and breaching, with the presenter.
• DD-145 Dolphins: Dolphins breathe voluntarily, so they can't fully lose consciousness for long. Instead they use unihemispheric slow-wave sleep, in which one half of the brain sleeps while the other stays awake. During it, the eye opposite the waking hemisphere often stays open, which lets the animal surface to breathe, watch for threats and keep in contact with its group. The behavior is also seen in some other marine mammals and in birds. The footage shows dolphins swimming, with the presenter.
• DD-146 King Tiger: The Tiger II, nicknamed 'King Tiger' by Allied soldiers, was a German heavy tank of the Second World War, used in combat from 1944 to 1945. It weighed about 68 to 70 tonnes and carried the 8.8 cm KwK 43 L/71 gun. Its sloped frontal armor, up to 180 mm thick on the turret, was hard for most Allied tank guns of the time to penetrate from the front. About 490 were built. Its weight strained the engine and drivetrain, which were prone to breakdowns, and it was difficult to transport and to cross many bridges. The footage shows archive and museum images of the Tiger II, with the presenter.
• DD-147 Destroyer: The Arleigh Burke class has the longest production run of any U.S. Navy surface combatant, built in successive 'Flights' up to Flight III with the newer AN/SPY-6 radar, and the Navy may procure up to 117 ships in all. Upgrades have also given the class a ballistic-missile-defense role. Its namesake, Admiral Arleigh Burke, led the 'Little Beavers' destroyer squadron in World War II and later served as Chief of Naval Operations.
• DD-148 Typhoon: The Eurofighter Typhoon is a twin-engine multirole fighter built by a consortium of Airbus, BAE Systems and Leonardo. It first flew in 1994 and entered service in 2003. It uses a canard-delta layout, with small foreplanes (canards) ahead of a delta wing. The design is aerodynamically unstable, and a digital fly-by-wire system keeps it under control, which gives the aircraft high agility. It's flown by Germany, the UK, Italy, Spain and Austria, and also by Saudi Arabia, Oman, Kuwait and Qatar. The footage shows Typhoons in flight and on the ground, with the presenter.
• DD-149 Subs: A submarine controls its buoyancy with ballast tanks. Flooding the main ballast tanks with seawater makes the boat heavier than the water it displaces, so it submerges; blowing the water out with compressed air makes it lighter, so it surfaces. Smaller trim tanks and the boat's diving planes fine-tune its depth and balance underwater. Submarines are used by navies for patrol, reconnaissance and deterrence, and research submersibles explore the deep sea. The first submarine to sink an enemy warship was the Confederate H. L. Hunley, in 1864. The footage shows submarines surfacing and underway, with the presenter.
• DD-150 Helo: Military helicopters fill many roles, including troop transport, reconnaissance, search and rescue, medical evacuation and close air support, because they can hover and land almost anywhere. The Boeing AH-64 Apache is a US attack helicopter that first flew in 1975 and entered service with the US Army in 1986; it is also flown by many other countries. A pinnacle landing is a standard helicopter technique for landing on a peak, ridge or other elevated spot where wind and limited space make the approach harder. It's taught to helicopter pilots generally, not only Apache crews. The footage shows Apaches and other military helicopters, with the presenter.
• DD-151 Railguns: A railgun is an electromagnetic launcher. A very large electric current runs up one rail, through a conductive projectile or armature, and back down the other rail; the magnetic field this creates pushes the projectile along the rails at very high speed. Conventional guns use chemical propellant instead. The US Navy researched railguns for years and tested prototypes, but paused its program in 2021. Japan's defense agency reported test-firing a railgun from a ship in 2023. Problems include rail wear and the huge power the guns need. The footage shows railgun tests and launches, with the presenter.
• DD-152 SAMs: A surface-to-air missile (SAM) is launched from the ground or a ship to destroy aircraft, helicopters, drones or other missiles. Guidance varies: some SAMs ride a radar beam or home on radar energy reflected from the target, some home on infrared (heat), and some combine methods. Systems range from shoulder-fired missiles such as the Stinger to long-range systems such as the Patriot and S-400. SAMs were first used in combat in the Second World War era and became widespread during the Cold War. The footage shows SAM launchers and launches, with the presenter.
• DD-153 Iguazu: Iguazu Falls are waterfalls on the Iguazu River, on the border between Argentina's Misiones Province and Brazil's Paraná state. The system is made up of about 275 individual falls along roughly 2.7 km (1.7 miles) of the river's edge. The largest, the Devil's Throat, is a U-shaped chasm. The falls sit within two national parks, Iguazú in Argentina and Iguaçu in Brazil, both UNESCO World Heritage Sites, surrounded by subtropical Atlantic Forest. The footage shows the falls from above and from viewpoints, with the presenter.
• DD-154 Cloud Envy: Lenticular clouds are stationary, lens-shaped clouds. They form when stable, moist air flows over a mountain or other obstacle and sets up a series of atmospheric waves downwind. Where the air rises in a wave, it cools and its moisture condenses into cloud; where it sinks again, the cloud evaporates. Because the wave stays in place, the cloud seems to hover. Layers can stack into a 'pile of plates'. Glider pilots use the lift in these waves, while powered aircraft may avoid the turbulence. Their saucer shape has led to some UFO reports. The footage shows lenticular clouds over mountains, including Mount Fuji, with the presenter.
• DD-155 Fire Works: Heating certain metals in a flame gives off light of characteristic colors, which is the basis of the flame test in chemistry. Firework makers use metal salts for color: strontium gives red, calcium orange, sodium yellow, barium green and copper blue. Lithium also gives a red flame. Blue is the hardest firework color to make, because copper compounds give a clean blue only in a narrow temperature range. The footage shows flames, fireworks and colored burns, with the presenter.
• DD-156 Eiffel: The Eiffel Tower is a wrought-iron lattice tower on the Champ de Mars in Paris, built by Gustave Eiffel's company as the entrance arch to the 1889 World's Fair. During construction, a group of artists and intellectuals published a protest against it. It was the world's tallest structure until the Chrysler Building in New York was completed in 1930. It stood 324 m (1,063 ft) with its antennas; new antennas brought it to about 330 m in 2022. It has become a global symbol of Paris and France. The footage shows the tower and a portrait of Gustave Eiffel, with the presenter.
• DD-157 Empire State: The Empire State Building is a 102-story Art Deco skyscraper in Midtown Manhattan, New York City. Designed by Shreve, Lamb & Harmon, with William F. Lamb as chief designer, it was built during the Great Depression and opened on May 1, 1931, about 410 days after construction began. Its roof is 381 m (1,250 ft) high, and its tip reaches 443 m (1,454 ft). It was the world's tallest building until the North Tower of the World Trade Center topped out in 1970. The footage shows the building and city views, with the presenter.
• DD-158 Burj Khalifa: The Burj Khalifa in Dubai, United Arab Emirates, is the world's tallest building at 828 m (2,717 ft). It was designed by Adrian Smith while at Skidmore, Owings & Merrill (SOM), and it opened in January 2010. Its Y-shaped plan and spiraling setbacks are partly inspired by Islamic architecture and a regional desert flower, and they help 'confuse the wind' by stopping organized vortices from forming. The exterior is clad in reflective glass and aluminum and textured stainless steel panels. The footage shows the tower from the air and from below, with the presenter.
• DD-159 Panda Panda Panda: The giant panda (Ailuropoda melanoleuca) is a bear native to the mountains of central China. Bamboo makes up more than 99% of its diet. A panda grips bamboo with a 'pseudo-thumb', an enlarged wrist bone (the radial sesamoid). Females are fertile for only about two to three days a year, and breeding programs have used artificial insemination. The IUCN downgraded the species from Endangered to Vulnerable in 2016 as wild numbers rose. The footage shows giant pandas eating and climbing, with the presenter.
• DD-160 These Cats Are Climbing: The leopard (Panthera pardus) is a big cat with a pale yellow to golden coat marked by dark rosettes. It has the widest range of any wild cat, across much of sub-Saharan Africa and parts of Asia, from rainforest to desert edges and mountains. Leopards are strong climbers and often haul their kills into trees, sometimes prey heavier than themselves, to keep them away from lions and hyenas. They are mostly solitary and active at night. The footage shows leopards in trees and on the ground, with the presenter.
• DD-161 Golden Monkeys: The golden snub-nosed monkey (Rhinopithecus roxellana) is an Old World monkey of the mountain forests of central and southwest China. It has golden-orange fur, a pale blue face and a short, upturned nose. It lives at about 1,500 to 3,400 m, where winters bring snow, and eats lichens, leaves, bark, buds and seeds. Groups are organized as small units, each with one male, several females and young, which join together in large bands. The species is listed as Endangered. The footage shows golden snub-nosed monkeys in snowy forests, with the presenter.
• DD-162 Sea Cows: The dugong (Dugong dugon) is a marine mammal related to manatees; together they form the order Sirenia, often called sea cows. Dugongs live in warm coastal waters from East Africa and the Red Sea across the Indian Ocean to Australia and the western Pacific. Adults are typically about 3 m long and often weigh 250 to 400 kg, though large individuals can be heavier. They feed almost entirely on seagrass, swim with a fluked tail, and usually dive for a few minutes at a time. The species is listed as Vulnerable. The footage shows dugongs grazing and swimming, with the presenter.
• DD-163 King Cobra: The king cobra (Ophiophagus hannah) is the world's longest venomous snake, reaching about 5.5 m, with a record of about 5.85 m. It lives in forests from India through Southeast Asia to southern China and Indonesia. When threatened it raises the front of its body and spreads a hood formed by elongated ribs and loose skin. It feeds mainly on other snakes. In 2024, researchers proposed splitting it into four species. The footage shows king cobras raising their hoods, with the presenter.
• DD-164 Turning Red: The red panda (Ailurus fulgens) is a small mammal of the eastern Himalayas and southwestern China, including Nepal, Bhutan, India and Myanmar. It's the only living member of its own family, Ailuridae, and isn't closely related to the giant panda or other bears. It has reddish-brown fur, a ringed tail and, like the giant panda, an enlarged wrist bone that helps it grip bamboo. Red pandas are skilled climbers and spend much of their time in trees. They are listed as Endangered. One of their nicknames is 'firefox'. The footage shows red pandas climbing and eating, with the presenter.
• DD-165 Shine Bright: Diamond is carbon with its atoms arranged in a cubic crystal lattice. Most natural diamonds formed about 150 to 250 km deep in Earth's mantle, under high pressure and temperature, and many are more than a billion years old. They reach the surface in rare, deep-sourced volcanic eruptions whose remains are called kimberlite (and lamproite) pipes, where they are mined. Diamond is the hardest natural material, rating 10 on the Mohs scale. The footage shows rough and cut diamonds and mines, with the presenter.
• DD-166 Azure Asterism: Sapphire is gem corundum, aluminum oxide, in any color except red, which is called ruby. Blue sapphire gets its color from iron and titanium, and sapphires also come in pink, yellow, green and colorless forms. Some sapphires show asterism, a six-rayed star caused by light reflecting off needle-like rutile inclusions. The Star of India is a 563-carat grayish-blue star sapphire held by the American Museum of Natural History in New York, and it is unusual for being nearly free of flaws. The footage shows blue and fancy sapphires and the Star of India, with the presenter.
• DD-167 Ruby Red: Ruby is the red gem variety of corundum, crystalline aluminum oxide. Its color comes from small amounts of chromium; corundum in other colors is called sapphire. Color is the most important factor in a ruby's value, with a deep, vivid red (often called 'pigeon's blood') prized most. Rubies rate 9 on the Mohs hardness scale, behind only diamond among common gems. Rubies have long carried cultural meanings of passion and protection in many traditions. The footage shows cut and rough rubies, with the presenter.
• DD-168 Quartz Crystals: Quartz is silicon dioxide (SiO2) and one of the most common minerals in Earth's continental crust. It forms hexagonal crystals and comes in many varieties; clear, colorless quartz is called rock crystal. Quartz is piezoelectric: mechanical stress produces an electric charge, and an applied voltage makes it flex. Quartz clocks and watches use this, driving a small crystal resonator, usually tuned to 32,768 Hz, and counting its vibrations to keep time. The footage shows quartz crystals, a demonstration spark and a watch movement, with the presenter.
• DD-169 Opulent Opal: Opal is hydrated amorphous silica. Precious opal shows play-of-color, flashes of spectral color that shift with the viewing angle, while common opal doesn't. The effect comes from diffraction: precious opal is built from tiny silica spheres packed in a regular lattice, and their size and spacing set which colors appear. Australia produces most of the world's precious opal. Folklore around opals ranges from good luck to bad luck. The footage shows polished and rough opals, with the presenter.
• DD-170 Exceptionally Emerald!: Emerald is the green variety of the mineral beryl, colored by traces of chromium and sometimes vanadium. Its name comes, via Old French and Latin, from the Greek smaragdos, 'green gem'. Colombia is the world's largest producer, and its Muzo mine is famous for fine emeralds. Most emeralds have inclusions, nicknamed 'jardin' (French for garden) for their mossy look, and these are widely accepted. The footage shows rough and cut emeralds, with the presenter.
• DD-171 Feeling Rosy: Roses belong to the genus Rosa in the family Rosaceae, with over 300 species and tens of thousands of cultivars. Most species are native to Asia, with smaller numbers from Europe, North America and northwest Africa. Roses have been grown since ancient times for their beauty and scent; rose oil from petals is used in perfume, and rose hips and rose water are used in food. The footage shows rose gardens and blooms, with the presenter.
• DD-172 Sun Seekers: Young sunflower plants (Helianthus annuus) show heliotropism: before the flower heads open, the buds turn to follow the Sun from east to west during the day and swing back to face east overnight. The motion is driven by an internal clock and uneven stem growth. Once the heads mature and bloom, they stop tracking and mostly stay facing east, which warms them in the morning and draws more pollinators. A uniform field of east-facing heads can give the false impression that open flowers track the Sun. The footage shows sunflower fields, with the presenter.
• DD-173 Sakura: Cherry blossoms, sakura in Japanese, are the flowers of several Prunus species. In Japan they bloom briefly in spring, and their timing depends mainly on temperature, so warm springs bring earlier blooms. The Japan Meteorological Agency and private forecasters track a 'cherry blossom front' moving north. Hanami, the custom of viewing the blossoms, dates back over a thousand years, and records of bloom dates in Kyoto go back to the 9th century. The footage shows blossoming trees, with the presenter.
• DD-174 Busy Busy Bees: Honey bees use the waggle dance to tell nestmates where to find food, water or new nest sites. A returning forager runs a figure-eight on the comb; the angle of the straight 'waggle run' relative to vertical shows the direction of the food relative to the Sun, and the duration of the waggle shows the distance. Karl von Frisch decoded the dance and shared the 1973 Nobel Prize in Physiology or Medicine for his work on bee behavior. The footage shows bees on flowers and in the hive, with the presenter.
• DD-175 Nectar Collectors: Butterflies have taste receptors on their palps and feet, and the tips of their antennae carry receptors that detect odors. By landing on a leaf and touching it with their feet, females can check whether a plant is a suitable host for their caterpillars before laying eggs. The same senses help adults find nectar, which they drink through a long coiled proboscis. The footage shows butterflies feeding on flowers, with the presenter.
• DD-176 Your Favorite Beetle: Ladybugs, or ladybirds, are small beetles of the family Coccinellidae, with about 6,000 species. Many are brightly colored and spotted, which warns predators that they taste bad. Most species are predators of soft-bodied pests such as aphids, scale insects and mites, and some have been released for biological pest control. A few species eat plants or fungi instead. Ladybugs appear in folklore in many cultures as a sign of good luck. The footage shows ladybugs on plants, with the presenter.
• DD-177 Amazing Bear Ability: Bears have one of the keenest senses of smell of any land mammal. Their large nasal cavities hold a huge surface of scent-detecting tissue. The US National Park Service says a bear's sense of smell is about seven times better than a bloodhound's, and bears are widely reported to smell food from miles away. They use smell to find food, track mates and cubs, and detect other bears and people. The footage shows bears sniffing and foraging, with the presenter.
• DD-178 Shear Delight: Sheep (Ovis aries) are social flock animals. In a 2001 study, researchers at the Babraham Institute in Cambridge found that sheep could recognize the faces of about 50 other sheep and remember them for up to two years. A 2017 study showed sheep could also learn to recognize photos of familiar human faces. Sheep have a wide field of view and good hearing, including higher frequencies than people can hear. The footage shows sheep in fields and flocks, with the presenter.
• DD-179 Based Bunnies: Rabbits are small mammals in the family Leporidae, together with hares. They have long ears, strong hind legs and short, fluffy tails. Rabbits are herbivores that eat mostly grasses and other plants, and their teeth grow continuously throughout life, so they need tough, fibrous food to keep them worn down. Females have a gestation of about a month and can have several litters a year; the young are called kits or kittens. Rabbits are crepuscular, most active at dawn and dusk. The footage shows rabbits feeding and resting, with the presenter.
• DD-180 The Prancing Horse: Ferrari is an Italian sports car maker based in Maranello. Enzo Ferrari, who had run Alfa Romeo's racing team, founded Auto Avio Costruzioni in 1939; the first car bearing the Ferrari name, the 125 S, followed in 1947. Its prancing horse emblem was the symbol of the First World War pilot Francesco Baracca, and its red, rosso corsa, was Italy's traditional international racing color. Ferrari is the oldest and most successful team in Formula One. It builds cars in limited numbers, which helps their value. The footage shows Ferrari cars and badges, with the presenter.
• DD-181 Lamborghini: Automobili Lamborghini was founded in 1963 by Ferruccio Lamborghini, who had made his fortune building tractors, to compete with established grand touring brands such as Ferrari. It is based in Sant'Agata Bolognese, Italy, and has been owned by the Volkswagen Group through Audi since 1998. The 1966 Miura set the pattern for mid-engined supercars, and the Countach introduced the scissor doors that later models such as the Aventador kept. The Huracán, built from 2014 to 2024, used a naturally aspirated V10. The footage shows Lamborghini cars, with the presenter.
• DD-182 Hypercar Luxury: Bugatti was founded in 1909 by the Italian-born Ettore Bugatti in Molsheim, Alsace, then part of the German Empire and part of France since 1919. Its pre-war cars won many races, and the Type 41 Royale was one of the largest luxury cars ever built. After decades of closures and revivals, Volkswagen relaunched the brand in Molsheim, building the Veyron from 2005 and the Chiron from 2016. Since 2021 it has been part of Bugatti Rimac. A horseshoe-shaped grille is a long-running Bugatti signature. The footage shows Bugatti cars and details, with the presenter.
• DD-183 Spirit of Ecstasy: Rolls-Royce Limited was founded in 1906 by Charles Rolls and Henry Royce in Britain. It built luxury cars and, from the First World War, aircraft engines. In 1971 the company went bankrupt and was nationalized; the car business was later separated, and since 2003 Rolls-Royce Motor Cars has been owned by BMW, while Rolls-Royce Holdings makes aircraft engines. The Spirit of Ecstasy hood mascot, sculpted by Charles Sykes, has appeared since 1911. Rolls-Royce describes the smooth ride of its cars as a 'magic carpet ride'. The footage shows Rolls-Royce cars and interiors, with the presenter.
• DD-184 Pagani Automobili: Pagani Automobili is an Italian maker of hypercars, founded in 1992 by the Argentine-born Horacio Pagani in San Cesario sul Panaro, near Modena. Pagani had worked at Lamborghini, where he helped develop the use of carbon fiber composites. The company's first car, the Zonda, appeared in 1999, followed by the Huayra in 2011 and the Utopia in 2022. Its cars use carbon-fiber and carbon-titanium composites and are built by hand in small numbers. The footage shows Pagani cars and details, with the presenter.
• DD-185 McLaren Automotive: McLaren began in 1963 when New Zealand driver Bruce McLaren founded Bruce McLaren Motor Racing, which entered Formula One in 1966. Bruce McLaren died in a testing crash in 1970, but the team became one of the most successful in F1. The McLaren F1 road car of the 1990s was for years the fastest production car. McLaren Automotive, the road-car company based in Woking, England, launched its first model, the MP4-12C, in 2011, and its cars are known for carbon-fiber chassis. The footage shows McLaren cars, with the presenter.
• DD-186 Money Isn't Real?: Fiat money is currency that isn't backed by a physical commodity such as gold or silver. Its value comes from government decree, its status as legal tender, and people's trust in the issuer. It lets central banks adjust the money supply and interest rates, but it can lose value through inflation if trust or discipline fails. Most major currencies, including the US dollar, euro and Japanese yen, are fiat currencies. The US ended the dollar's last link to gold in 1971, when President Nixon suspended its convertibility for foreign governments. The footage shows banknotes and money, with the presenter.
• DD-187 Fair & Efficient Markets: The US Securities and Exchange Commission (SEC) was created by the Securities Exchange Act of 1934, after the 1929 stock market crash and during the Great Depression. Its stated mission is to protect investors, maintain fair, orderly and efficient markets, and facilitate capital formation. It requires public companies to disclose financial and other information, oversees exchanges, brokers and investment advisers, and brings civil enforcement actions for violations such as fraud and insider trading. Joseph P. Kennedy was its first chairman. The footage shows the SEC building and market screens, with the presenter.
• DD-188 Future of Finance: A cryptocurrency is a digital currency that uses cryptography to secure transactions and usually runs on a decentralized ledger called a blockchain rather than through a central bank. Bitcoin, launched in January 2009 by the pseudonymous Satoshi Nakamoto, was the first decentralized cryptocurrency. Thousands of others, often called altcoins, have followed. Supporters point to lower barriers to access and to privacy; critics and regulators point to price volatility, fraud, and use in illegal activity. Regulation varies widely by country. The footage shows coin graphics and charts, with the presenter.
• DD-189 Serving Great White: The great white shark (Carcharodon carcharias) is a large predatory shark found in coastal waters worldwide. Off places such as South Africa's False Bay, great whites ambush Cape fur seals from below at speed, sometimes breaching clear of the water. Like many sharks, great whites can be put into tonic immobility, a trance-like state, often by turning them upside down; researchers use it to handle sharks more safely. Orcas have also been seen using the effect on sharks. The footage shows great whites breaching and swimming, with the presenter.
• DD-190 Largest Crabs on Earth!: Spider crabs are crabs of the superfamily Majoidea, named for their long, thin legs. The Japanese spider crab (Macrocheira kaempferi) has the largest leg span of any arthropod, up to about 3.7 m. Many spider crabs decorate their shells with sponges, algae and debris for camouflage. In southern Australia, giant spider crabs (Leptomithrax gaimardii) gather in huge aggregations of thousands each year to molt together, which researchers think protects them while their new shells harden. The footage shows spider crab aggregations and Japanese spider crabs, with the presenter.
• DD-191 Seahorse Secrets: Seahorses (genus Hippocampus) are small marine fish. They are among the few animals in which the male becomes pregnant: during mating the female deposits her eggs into a brood pouch on the male's belly, where he fertilizes them and supplies oxygen and nutrients as they develop. After roughly two to four weeks, depending on the species, he releases the young through muscular contractions, sometimes hundreds or more at once. The footage shows seahorses and a male giving birth, with the presenter.
• DD-192 Really, Killer! Whales: The orca, or killer whale (Orcinus orca), is the largest member of the dolphin family. Many populations live in matrilineal groups in which offspring stay with their mothers, and older females, including post-reproductive grandmothers, lead the group and help it find food. Pods cooperate to hunt, sometimes using techniques passed on within the group. Orca pods have distinct vocal dialects, sets of calls shared within a group and different from other groups'. The footage shows orca pods hunting and swimming, with the presenter.
• DD-193 Blue Bloods: Squid and other cephalopods carry oxygen with hemocyanin, a large copper protein that floats freely in the blood. It moves far less oxygen per unit of blood than hemoglobin but performs better in cold, low-oxygen water, and the extra hearts and kidney-linked gill hearts are part of how the animal copes.
• DD-194 Long-Living Like Larry: Lobsters show indeterminate growth: they keep growing throughout life by molting their exoskeleton. Older lobsters remain fertile and don't show obvious signs of aging in the usual ways, partly because they keep producing telomerase, an enzyme linked to cell repair. Lobsters aren't immortal, though. Each molt takes more energy as they get bigger, and many old lobsters die from exhaustion during molting or from shell disease. American lobsters are estimated to live for decades, possibly 100 years. The footage shows lobsters on the seabed and in aquariums, with the presenter.
• DD-195 The City of 10,000 Shrines: Kyoto was Japan's imperial capital from 794 until 1868, when the emperor moved to Tokyo. The city has around 1,600 Buddhist temples and hundreds of Shinto shrines, and 17 of its sites are part of a UNESCO World Heritage listing. Fushimi Inari Taisha is known for thousands of vermilion torii gates lining trails up Mount Inari. Kinkaku-ji, the Golden Pavilion, is a Zen temple whose upper floors are covered in gold leaf. Kyoto is also known for its wooden machiya townhouses, the Arashiyama bamboo grove, tea culture and geiko (geisha) districts such as Gion. The footage shows Kyoto's shrines, temples and streets, with the presenter.
• DD-196 Thera: Santorini, officially Thira (ancient Thera), is a Greek island group in the southern Aegean Sea. Its crescent shape is the rim of a flooded caldera left mainly by the Minoan eruption, about 3,600 years ago, one of the largest volcanic eruptions in human history; it buried the Bronze Age town of Akrotiri. The towns of Fira and Oia sit on the caldera cliffs, known for whitewashed houses and blue-domed churches. The island's volcanic soil supports vineyards growing native grapes such as Assyrtiko. The footage shows Santorini's cliffs, villages and sunsets, with the presenter.
• DD-197 Catalan Gothic: Barcelona is the capital of Catalonia, Spain. Its best-known building, the Basílica de la Sagrada Família, designed by Antoni Gaudí, has been under construction since 1882. Gaudí worked on it until his death in 1926. The Gothic Quarter (Barri Gòtic) preserves narrow medieval streets around Barcelona Cathedral, a Catalan Gothic church built mainly from the 13th to 15th centuries, with its facade finished in the late 19th century. La Rambla is a tree-lined boulevard running from the city center to the old port. The footage shows Barcelona's streets and churches, with the presenter.
• DD-198 The Red City: Marrakech is a city in western Morocco, founded around 1070 by the Almoravids. It's nicknamed the Red City for the red-ochre color of its walls and buildings. Its medina, the walled old city, has been a UNESCO World Heritage Site since 1985 and is known for its souks selling spices, textiles and crafts. Jemaa el-Fnaa, the main square, fills each evening with food stalls, musicians and storytellers, and UNESCO lists its cultural space as intangible heritage. The footage shows the Koutoubia minaret, souks and the square, with the presenter.
• DD-199 Soft Coral Capital of the World!: Fiji is an island country in Melanesia in the South Pacific, made up of more than 330 islands, about 110 of them permanently inhabited. Its largest island is Viti Levu, home to the capital, Suva, and to the Coral Coast, a stretch of the south shore lined with fringing reefs and resorts. Fiji's reefs are famous for soft corals, earning it the nickname 'soft coral capital of the world', with sites such as the Rainbow Reef. The interior of Viti Levu has rainforest, waterfalls and traditional villages. The footage shows Fiji's beaches, reefs, waterfalls and villages, with the presenter.
• DD-200 Visit This Tropical Paradise: Bora Bora is an island in the Leeward Islands of French Polynesia, an overseas collectivity of France in the South Pacific. A central island of volcanic origin, topped by Mount Otemanu (727 m), the eroded remnant of an extinct volcano, sits inside a lagoon ringed by a barrier reef and motu (small islets). The island is known for luxury resorts with overwater bungalows, and for snorkeling and diving among coral, reef fish, rays and sharks. The footage shows the lagoon, bungalows and reef life, with the presenter.
• DD-201 Three-Horned-Face!: Triceratops was a large plant-eating ceratopsian dinosaur that lived in western North America about 68 to 66 million years ago, at the very end of the Cretaceous, making it one of the last non-avian dinosaurs. Its name means 'three-horned face'. It had a long horn above each eye, a shorter horn on the nose, and a solid bony frill. Healed injuries on fossils suggest the horns were used in fights with rivals, and possibly in defense; the frill may have served for display. It cropped plants with a parrot-like beak. Adults grew to about 8 to 9 m long. The footage shows Triceratops reconstructions, with the presenter.
• DD-202 The Cretaceous King: Tyrannosaurus rex was a large meat-eating dinosaur that lived in western North America about 68 to 66 million years ago. The largest specimens reached about 12 m long and weighed an estimated 8 tonnes or more, with hips about 4 m off the ground. Its arms were short but strong, while its legs and tail were powerful. Studies estimate it had one of the strongest bites of any land animal, able to crush bone, and a keen sense of smell. How it balanced hunting with scavenging is still debated. The footage shows Tyrannosaurus reconstructions, with the presenter.
• DD-203 The Order of Pterosauria: Pterosaurs (order Pterosauria) were flying reptiles, close relatives of dinosaurs but not dinosaurs themselves. They were the first vertebrates known to have evolved powered flight, on wings of skin stretched along a hugely long fourth finger. Pteranodon lived in North America about 86 to 84.5 million years ago, in the Late Cretaceous. Adult males had wingspans of about 5.6 to 6 m or more, with some estimates near 7 m, and a long, backward-pointing crest. It flew over the sea and ate fish. The footage shows pterosaur reconstructions, with the presenter.
• DD-204 Iran: Iran, officially the Islamic Republic of Iran, is a country in West Asia. Its territory was the heart of several Persian empires, beginning with the Achaemenid Empire founded by Cyrus the Great in the 6th century BC. The country was widely known abroad as Persia until 1935, when the government asked foreign governments to use the name Iran. Since the 1979 revolution it has been an Islamic republic. Persian (Farsi) is the official language, and Azerbaijani, Kurdish, Luri, Arabic, Baluchi and other languages are also spoken. Iran has had tense relations with several countries in recent decades, including over its nuclear program. The footage shows Iranian cities, mosques and landscapes, with the presenter.
• DD-205 Russia & The Ukraine: The Russo-Ukrainian War began in February 2014, when Russia occupied and then annexed Crimea from The Ukraine, and Russian-backed separatists took up arms in the Donbas region of eastern The Ukraine. On February 24, 2022, Russian President Vladimir Putin announced what he called a 'special military operation', and Russia launched a full-scale invasion of The Ukraine, the largest attack on a European country since the Second World War. By June 2022, the Ukrainian government said Russia held about 20% of The Ukraine's territory. The war has killed or wounded large numbers of soldiers and civilians, and millions of people from The Ukraine have been displaced inside the country or have fled abroad. The footage shows news coverage from 2014 to 2022, with the presenter.
• DD-206 The Land of Israel: Israel declared independence on May 14, 1948, as the British Mandate for Palestine ended. Neighboring Arab states invaded the next day, starting the 1948 Arab-Israeli War; the war also displaced hundreds of thousands of Palestinian Arabs. Israel has since fought further wars with neighboring states, including in 1967 and 1973. Jerusalem is holy to Judaism, Christianity and Islam. Israel designates Jerusalem as its capital, while Palestinians seek East Jerusalem as the capital of a future state, and the city's status is disputed internationally. The footage shows Jerusalem and other locations, with the presenter.
• DD-207 Tyler, The Creator: Tyler, the Creator moved away from the horrorcore of his early albums toward jazz, soul and R&B after Wolf (2013). Alongside his music he founded the Golf Wang and Le Fleur clothing brands and the annual Camp Flog Gnaw Carnival, and his recent albums have debuted at number one in the U.S. His albums IGOR and Call Me If You Get Lost won the Grammy for Best Rap Album in 2020 and 2022.
• DD-208 Yeah I Dig: Minecraft is a sandbox video game created by Markus 'Notch' Persson and developed by Mojang Studios, released in full in 2011. Its procedurally generated worlds are built from blocks that players can mine and place, letting them explore, survive and build almost anything. Microsoft bought Mojang in 2014 for $2.5 billion. Minecraft is the best-selling video game of all time, with more than 300 million copies sold by 2023. Players have built huge creations and use it in education. The footage shows Minecraft builds and gameplay, with the presenter.
• DD-209 It Better Be Boron!: Boron is element 5, a metalloid. It's an essential micronutrient for plants, needed for cell walls and growth. Adding boron oxide to glass makes borosilicate glass, which has low thermal expansion and resists thermal shock, so it's used for lab glassware and some cookware. Small amounts of boron improve the hardenability of steel, and boron carbide is one of the hardest known materials. Boron is used as a dopant in silicon semiconductors and in fiberglass, and borates such as borax are used in detergents and bleaches. The footage shows lab experiments, glassmaking and fields, with the presenter.
• DD-210 Carved by Ancient Rivers: A canyon is a deep, narrow valley with steep sides, most often cut by a river over millions of years. As the land is uplifted or the base level drops, the river keeps cutting down, exposing layered rock in the walls; geologists read these layers as a record of past environments. The Grand Canyon, carved by the Colorado River, exposes rocks spanning nearly 2 billion years. Canyons are also shaped by weathering, flash floods and, in some places, glaciers. Many are protected as parks. The footage shows canyons from the air and the rim, with the presenter.
• DD-211 Where Your Food Is Grown: Plains are broad areas of flat or gently rolling land. Many have deep, fertile soils built up by rivers, glaciers or wind-blown loess, which makes them some of the world's most productive farmland; the North American Great Plains and the Eurasian steppe are major grain regions. Grasslands on plains support grazing animals such as bison in North America and antelope and gazelles in Africa and Asia. Floodplains along rivers absorb floodwaters and renew soils with fresh sediment. The footage shows plains, farmland and herds, with the presenter.
• DD-212 Earth's Harshest Biome: Tundra is a treeless biome where cold temperatures and short growing seasons limit plant growth. Arctic tundra rings the far north, and alpine tundra occurs on high mountains; small areas of Antarctic tundra exist too. Below the surface lies permafrost, ground that stays frozen for at least two years in a row. Mosses, lichens, sedges and dwarf shrubs grow there, and animals include caribou, Arctic foxes and many migratory birds that breed in summer. Permafrost holds large amounts of organic carbon, and warming that thaws it can release carbon dioxide and methane. The footage shows tundra landscapes behind the presenter.
• DD-213 The First Roman Emperor: Augustus, born Gaius Octavius in 63 BC, was the great-nephew and adopted son of Julius Caesar. After Caesar's assassination in 44 BC and years of civil war, he defeated Mark Antony and Cleopatra and became Rome's first emperor in 27 BC, ruling until his death in AD 14. His reign began the Pax Romana, about two centuries of relative peace. He used art, coins and building programs to shape his public image. The biographer Suetonius wrote that he lived modestly and usually wore clothes made at home by his wife, sister, daughter and granddaughters. The footage shows statues and reconstructions of Augustus and Rome, with the presenter.
• DD-214 The Beast of Rome: Nero was Roman emperor from AD 54 to 68. He was known for his love of performing, singing and acting in public, which Roman elites considered beneath an emperor. After the Great Fire of Rome in AD 64, the historian Tacitus wrote that rumors blamed Nero and that he in turn blamed and punished Christians. In AD 67 Nero competed at the Olympic Games, which were rescheduled for his visit; ancient sources say he was declared the winner of the chariot race even though he fell and didn't finish. He died by suicide in AD 68 after being declared a public enemy. Some early Christian writings associated him with the 'Beast' of the Book of Revelation. The footage shows reconstructions of Nero and Rome, with the presenter.
• DD-215 Little Boot: Caligula, born Gaius Julius Caesar Germanicus in AD 12, was Rome's third emperor. His nickname, meaning 'little boot', came from the miniature soldier's boots he wore as a child in his father's army camps. He became emperor in AD 37 and was assassinated by members of the Praetorian Guard in January AD 41. Ancient writers such as Suetonius and Cassius Dio describe extravagant spending, cruelty and claims to divinity; modern historians note that these sources were hostile to him. According to Suetonius, he planned to make his horse Incitatus a consul. The footage shows illustrations of Caligula and Rome, with the presenter.
• DD-216 Canute the Great: Canute the Great (Cnut) was a Danish prince who became King of England in 1016, King of Denmark in 1018 and King of Norway in 1028, ruling all three until his death in 1035. Historians call this union the North Sea Empire. He kept peace in England for most of his reign, worked with the Church and English nobles, and supported trade across the North Sea. A later legend says he ordered the tide to stop to show his courtiers the limits of royal power. The footage shows illustrations of Canute and his court, with the presenter.
• DD-217 Charlemagne: Charlemagne (Charles the Great, about 747 to 814) was King of the Franks from 768 and King of the Lombards from 774. On Christmas Day 800, Pope Leo III crowned him Emperor of the Romans, a title later seen as the start of the Holy Roman Empire. His reign saw the Carolingian Renaissance, a revival of learning, art and religious scholarship through the Church, including new schools and the standardized Carolingian minuscule script. His biographer Einhard wrote that he tried to learn to write late in life but had little success. The footage shows illustrations of Charlemagne and his court, with the presenter.
• DD-218 The Last Czar: Nicholas II was the last Emperor of Russia, reigning from November 1894 until his abdication in March 1917. His reign included rapid industrial growth, defeat in the Russo-Japanese War of 1904 to 1905, the 1905 Revolution and Russia's entry into the First World War. Wartime losses and shortages fed the February Revolution of 1917, and he abdicated. In July 1918, Bolshevik forces shot Nicholas, his wife Alexandra, their five children and four attendants in Yekaterinburg. The Russian Orthodox Church canonized the family in 2000. The footage shows illustrations of Nicholas II, his family and Russia, with the presenter.
• DD-219 Russia's Greatest Empress: Catherine II, known as Catherine the Great, was born a German princess in 1729 and married the future Peter III of Russia. In 1762, months after he took the throne, a coup overthrew Peter and Catherine became empress, ruling until her death in 1796, longer than any other female ruler of Russia. Her reign saw territorial expansion, Enlightenment-era reforms, and patronage of the arts; the art collection she began in 1764 became the Hermitage Museum. She was a keen rider and often rode astride rather than sidesaddle. The footage shows illustrations of Catherine, her court and Russia, with the presenter.
• DD-220 The Virgin Queen: Elizabeth I ruled England and Ireland from 1558 until her death in 1603, the last monarch of the Tudor dynasty. Her reign is often called the Elizabethan era or a golden age, with the theater of Shakespeare and Marlowe, overseas exploration and the defeat of the Spanish Armada in 1588. She never married, and was celebrated as the Virgin Queen. Contemporaries noted her command of languages including Latin, Greek, French and Italian. The footage shows illustrations of Elizabeth, Tudor London and the Armada, with the presenter.
• DD-221 The Famine Queen: Queen Victoria ruled the United Kingdom from 1837 until her death in 1901, a reign of 63 years surpassed among British monarchs only by Elizabeth II. The Victorian era saw industrial, scientific and political change and the expansion of the British Empire; from 1876 she was also Empress of India. She is associated with strict moral standards but was a keen dancer in her youth. The nickname 'the Famine Queen' was used by the Irish activist Maud Gonne in a 1900 article, criticizing her government's record during the Great Famine of the 1840s; the Reel's voiceover does not discuss it. The footage shows illustrations of Victoria and Victorian Britain, with the presenter.
• DD-222 Khan of Khans: Genghis Khan, born Temüjin around 1162, united the Mongol tribes and was proclaimed Great Khan in 1206. He led campaigns across northern China and Central Asia that were both innovative and highly destructive, and introduced a legal code, a postal relay system and protections for trade along routes such as the Silk Road. He died in 1227. Under his successors the Mongol Empire grew into the largest contiguous land empire in history. The footage shows illustrations of Genghis Khan and the steppe, with the presenter.
• DD-223 SHŌGUN: Tokugawa Ieyasu (1543 to 1616) won the Battle of Sekigahara in 1600 and was appointed shogun in 1603, founding the Tokugawa shogunate. His successors ruled Japan from Edo, now Tokyo, until 1868, a period of about 265 years known as the Edo period. The era brought internal peace after more than a century of civil war, strict social order, economic growth and policies that sharply limited foreign contact. The footage shows illustrations of Ieyasu and Edo-era Japan, with the presenter.
• DD-224 Le Petit Caporal: Napoleon Bonaparte (1769 to 1821) rose through the French Revolutionary army, seized power in 1799 and crowned himself Emperor of the French in December 1804. His wars reshaped Europe until his defeats in 1814 and at Waterloo in 1815, after which he was exiled to Saint Helena. The Napoleonic Code of 1804 influenced civil law in many countries. 'Le Petit Caporal', the little corporal, was an affectionate nickname from his soldiers; he was about 1.69 m tall, roughly average for a Frenchman of his time. The footage shows illustrations of Napoleon, with the presenter.
• DD-225 Is This Equivalent Exchange: Fullmetal Alchemist is a manga by Hiromu Arakawa, serialized from 2001 to 2010, adapted as two anime series (2003 and Fullmetal Alchemist: Brotherhood, 2009). Brothers Edward and Alphonse Elric try to bring their mother back with alchemy; Edward loses a leg and an arm, and Alphonse his whole body, his soul bound to a suit of armor. They seek the Philosopher's Stone to restore themselves. Alchemy in the story follows the law of equivalent exchange: to gain something, something of equal value must be lost. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-226 You Are My Special: Jujutsu Kaisen is a manga by Gege Akutami, serialized from 2018 to 2024, adapted by MAPPA as an anime from 2020. High school student Yuji Itadori swallows a cursed finger belonging to Ryomen Sukuna, the King of Curses, and becomes his host, joining Tokyo Jujutsu High to train as a sorcerer who fights curses. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-227 Half-Human Half-Dog Demon: Rumiko Takahashi's Inuyasha, serialized from 1996 and adapted for television from 2000, became one of the best-selling manga series ever and won the Shogakukan Manga Award in 2002. Sunrise produced two anime series, and the franchise's popularity carried it to U.S. television and to a 2020 spin-off about the next generation.
• DD-228 KICK BACK!: Chainsaw Man is a manga by Tatsuki Fujimoto, first serialized in 2018, adapted by studio MAPPA as an anime in 2022. Denji, a young devil hunter crushed by his late father's debt, is killed and revived by fusing with his chainsaw devil-dog Pochita, becoming a hybrid with chainsaws for arms and a head. The anime's opening song, 'Kick Back', is by Kenshi Yonezu. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-229 RIP Akira Toriyama: Akira Toriyama (1955 to 2024) was a Japanese manga artist who created Dr. Slump and Dragon Ball, serialized from 1984 to 1995. Dragon Ball Z, the anime adaptation of the later part of his manga, aired from 1989 to 1996, following Goku and his friends against villains such as Vegeta, Frieza, Cell and Majin Buu, and popularized the Kamehameha and Super Saiyan transformations. He also designed characters for the Dragon Quest video games. He died on March 1, 2024; the death was announced on March 8. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-230 He Keeps Getting Stronger: Solo Leveling is a South Korean web novel by Chugong, first published in 2016, adapted into a webtoon in 2018 and an anime by A-1 Pictures in January 2024. Sung Jin-woo, an E-rank hunter, the weakest class, survives a deadly dungeon raid and gains a game-like system that lets him level up alone. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-231 Shinigami Love Apples: Death Note is a manga written by Tsugumi Ohba and illustrated by Takeshi Obata, serialized from 2003 to 2006 and adapted as an anime in 2006. Student Light Yagami finds a notebook dropped by the shinigami (death god) Ryuk that kills anyone whose name is written in it. Calling himself Kira, he kills criminals, and is hunted by the detective L. Ryuk is fond of human apples. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-232 A 1,000 Year Blood War: Bleach is a manga by Tite Kubo, serialized from 2001 to 2016, adapted as an anime from 2004 to 2012. Teenager Ichigo Kurosaki, who can see ghosts, gains the powers of a Soul Reaper and fights Hollows, evil spirits. The final arc, the Thousand-Year Blood War, was adapted as an anime starting in 2022. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-233 FIGHT!!!: Attack on Titan is a manga by Hajime Isayama, serialized from 2009 to 2021, adapted as an anime from 2013 to 2023. The last humans live inside three huge walls to escape giant man-eating Titans. After a Titan breaches the wall and kills his mother, Eren Yeager joins the Survey Corps with Mikasa Ackerman and Armin Arlert, uncovering the truth about the Titans. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-234 Mobile Suit Gundam: Mobile Suit Gundam, created by Yoshiyuki Tomino and studio Sunrise, premiered in April 1979. Set in the Universal Century calendar, it follows teenage pilot Amuro Ray in the RX-78-2 Gundam during the war between the Earth Federation and the space colonies of the Principality of Zeon. It launched a franchise of sequels, models and spin-offs, and helped define 'real robot' mecha stories. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-235 Believe It!: Naruto is a manga by Masashi Kishimoto, serialized from 1999 to 2014, adapted as an anime from 2002 and continued as Naruto Shippuden from 2007. Naruto Uzumaki, an outcast in the Hidden Leaf Village because the Nine-Tailed Fox is sealed inside him, dreams of becoming Hokage, the village leader. 'Believe it!' is his catchphrase in the English dub. The story continues in Boruto. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-236 Energizer: Lithium-ion batteries power phones, laptops and electric vehicles. Making them starts with mining and refining materials such as lithium, nickel, cobalt, manganese and graphite. These become the anode (usually graphite) and cathode (a lithium metal oxide), which are coated onto foils, combined with a separator and electrolyte, and sealed into cells. Cells are charged for the first time, aged and tested, then assembled into modules and packs. China dominates production, with most of the world's cell manufacturing capacity in the early 2020s. The footage shows battery factories and assembly lines, with the presenter.
• DD-237 Haha Car Go Brr: Mass car production begins with design and engineering, then sourcing materials such as steel, aluminum and plastics. Sheets of metal are stamped into panels, which robots weld into a body-in-white; parts are also molded and cast. The body is painted, then the powertrain, wiring, interior and trim are added on the assembly line by robots and workers. Finished cars go through inspections and road tests before shipping. Around 90 million motor vehicles were produced worldwide in 2023. The footage shows car factories and assembly lines, with the presenter.
• DD-238 The Future Is Now: Computer chips, or integrated circuits, are made on wafers of very pure silicon. Each wafer is coated with a light-sensitive photoresist and exposed to ultraviolet light through a mask in a step called photolithography, which prints the circuit pattern. Etching removes unwanted material, and the steps of deposition, doping, lithography and etching are repeated many times to build up billions of transistors. Finished wafers are tested and cut into individual dies, which are packaged into chips. The footage shows chip fabs and cleanrooms, with the presenter.
• DD-239 No.1 or No.2: A wooden pencil's core is not lead but a mix of graphite and clay; more clay makes a harder lead. In the usual method, slats of wood, often incense cedar, are grooved, the leads are laid in and glued, and a second grooved slat goes on top to form a 'sandwich', which is cut into individual pencils. The pencils are shaped, painted and stamped with a brand and grade. In the U.S. the No. 2 grade, roughly HB, is the standard writing pencil. Commonly cited estimates put world output at 14 to 15 billion pencils a year. The footage shows pencil factories, with the presenter.
• DD-240 Let's Mix It Up: Concrete is the second-most-used substance on Earth after water and has a history running from Roman opus caementicium to record-breaking dam pours. Its cement binder is a major source of carbon dioxide, which is driving research into lower-emission mixes.
• DD-241 Spinning a Yarn: Textiles are made from natural fibers such as cotton, wool and silk, or synthetic fibers such as polyester and nylon. Fibers are cleaned and combed, then spun, which twists them into yarn. Yarn is woven on looms, knitted, or the fibers are bonded into nonwovens to make fabric. The fabric is then dyed or printed and finished. Polyester is now the most produced fiber worldwide. The footage shows spinning, weaving and dyeing in textile mills, with the presenter.
• DD-242 Harder Than Before: Steel is an alloy of iron with a small amount of carbon, usually less than 2%, and often other elements. Most steel is made by smelting iron ore with coke in a blast furnace and then refining the iron in a basic oxygen furnace; much of the rest is made by melting scrap in electric arc furnaces. The steel is cast, then rolled or forged into shapes, and finished with heat and surface treatments. According to the World Steel Association, world production was about 1.89 billion tonnes in 2023. The footage shows furnaces, casting and rolling mills, with the presenter.
• DD-243 The Birth of the MCU: Iron Man was Marvel Studios' first self-financed film, distributed by Paramount, and it launched the Marvel Cinematic Universe. Jon Favreau embraced improvisation because the script was not finished when shooting began, and in 2022 the Library of Congress added the film to the National Film Registry.
• DD-244 The Strongest There Is: The Incredible Hulk, directed by Louis Leterrier and starring Edward Norton as Bruce Banner, was released in the U.S. on June 13, 2008, as the second film of the Marvel Cinematic Universe. Banner hides from the U.S. military while seeking a cure, and the film climaxes in a fight with the Abomination, played by Tim Roth. Robert Downey Jr. appears as Tony Stark in a closing scene. Mark Ruffalo took over the role from The Avengers (2012) onward. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-245 The Saga Continues: Iron Man 2, directed by Jon Favreau, was released in the U.S. on May 7, 2010, as the third film of the Marvel Cinematic Universe. Robert Downey Jr. returned as Tony Stark, Scarlett Johansson debuted as Natasha Romanoff (Black Widow), and Don Cheadle took over the role of James Rhodes, who becomes War Machine. Mickey Rourke played the villain Ivan Vanko. The film earned about $624 million worldwide. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-246 The God of Thunder: Thor, directed by Kenneth Branagh, was released in the U.S. on May 6, 2011, as the fourth film of the Marvel Cinematic Universe. Chris Hemsworth plays the Norse-inspired god, banished from Asgard to Earth, with Tom Hiddleston as his brother Loki and Natalie Portman as Jane Foster. Branagh, known for Shakespeare adaptations, gave the film a classical tone. It earned about $449 million worldwide. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-247 I Can Do This All Day: Captain America: The First Avenger was Marvel Studios' bet that a World War II origin story could anchor a modern franchise. Joe Johnston, chosen partly for his work on The Rocketeer, shot it in British cities standing in for 1940s New York, and it became one of the highest-grossing films set in that war.
• DD-248 Avengers Assemble!: The Avengers, written and directed by Joss Whedon, was released in the U.S. on May 4, 2012, closing Phase One of the Marvel Cinematic Universe. It brings together Iron Man, Captain America, Thor, the Hulk, Black Widow and Hawkeye against Loki, played by Tom Hiddleston, ending in the Battle of New York. Mark Ruffalo took over as Bruce Banner. It earned about $1.52 billion worldwide, at the time the third-highest-grossing film ever. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-249 Supercar Police: Since 2013, Dubai Police have added high-end sports and luxury cars to their fleet, including models from Lamborghini, Ferrari, Bentley, Bugatti and McLaren, in green-and-white livery. The cars are deployed mainly in tourist areas such as Downtown Dubai and Jumeirah, where they also serve for public relations and photos. The footage shows Dubai Police supercars on the streets, with the presenter.
• DD-250 Life on The Palm: Palm Jumeirah is an artificial archipelago off Dubai, built by land reclamation shaped like a palm tree with a trunk, 17 fronds and an encircling crescent breakwater. Construction began in 2001, using about 94 million cubic meters of sand and 7 million tonnes of rock. It holds hotels such as Atlantis The Palm, villas and apartments, and is served by the Palm Jumeirah Monorail, opened in 2009. The footage shows aerial views of the island and its buildings, with the presenter.
• DD-251 Astonishing Arabian Architecture: Dubai's skyline includes the Burj Khalifa, the world's tallest building at 828 m since 2010; the Burj Al Arab, a sail-shaped hotel opened in 1999 and often marketed as 'seven-star'; the Cayan Tower, a residential tower that twists 90 degrees over its height; and the Dubai Frame, a 150 m picture-frame structure opened in 2018 with views of old and new Dubai. The planned Dubai Creek Tower was meant to exceed the Burj Khalifa, but construction stopped around 2020. The footage shows Dubai's buildings, with the presenter.
• DD-252 Mall of the Emirates: Despite the title, the Reel's voiceover describes the Dubai Mall in Downtown Dubai, opened in 2008 and one of the largest malls in the world by total area, with more than 1,200 shops, the Dubai Aquarium and Underwater Zoo with its walk-through tunnel, an Olympic-size ice rink and a multi-level waterfall. It connects to the Burj Khalifa and sits beside the Dubai Fountain. The Mall of the Emirates, a separate mall opened in 2005 in Al Barsha, is home to Ski Dubai. The footage shows the Dubai Mall and other Dubai malls, with the presenter.
• DD-253 A Winter Oasis: Ski Dubai, built by the developer and operator of the Mall of the Emirates, opened in November 2005 as an artificial indoor mountain. It holds the hall at about −1 to 2 °C all year and claims the world's first indoor black diamond run.
• DD-254 Wanderlust & Desert Dust: Desert safaris are among Dubai's most popular tourist activities. Tours typically include dune bashing, driving 4x4 vehicles over the dunes of the Arabian Desert, or riding dune buggies, along with camel rides, sandboarding and an evening at a Bedouin-style camp with a barbecue dinner and entertainment. Many tours run in conservation areas such as the Dubai Desert Conservation Reserve. The footage shows dune buggies, 4x4s and desert camps, with the presenter.
• DD-255 Eyes in the Sky: Since Sputnik 1 in October 1957 the number of satellites has grown to almost 13,000 by mid-2025. GPS shows how much policy shaped the technology: it was opened to civilians after the loss of Korean Air Lines Flight 007 and only became fully accurate for them in 2000, while relativity has to be corrected for in every satellite clock.
• DD-256 Keep Looking, What Do You See?: The Hubble Space Telescope, a NASA project with the European Space Agency, was launched aboard Space Shuttle Discovery on April 24, 1990. A flaw in its main mirror was corrected by astronauts in 1993, and five servicing missions kept it working. Orbiting above the atmosphere, it takes sharp images free of atmospheric blur. Its observations helped pin down the age of the universe at about 13.8 billion years, supported the discovery of the universe's accelerating expansion and dark energy, and produced views of distant galaxies and nebulae. The footage shows Hubble in orbit and its images, with the presenter.
• DD-257 It IS Rocket Science: The Space Shuttle was NASA's partly reusable launch system, flown from April 12, 1981, to July 21, 2011. Each stack combined a winged orbiter, a large external fuel tank and two solid rocket boosters; the orbiter landed like a glider and was reused. The five orbiters that flew in space, Columbia, Challenger, Discovery, Atlantis and Endeavour, made 135 missions, launching satellites and probes, deploying and servicing the Hubble Space Telescope, and building much of the International Space Station. Two orbiters and 14 astronauts were lost, in the Challenger (1986) and Columbia (2003) disasters. The footage shows shuttle launches, with the presenter.
• DD-258 Look Up, Can You See It?: The International Space Station is a modular space station in low Earth orbit, at about 400 km (250 miles), circling Earth about every 90 minutes. Its first module launched in 1998, and it has been continuously crewed since November 2000. It is a joint project of NASA, Roscosmos, the European Space Agency, JAXA and the Canadian Space Agency, and serves as a microgravity laboratory. Because it is large and reflective, it is often visible from the ground as a bright moving point shortly after sunset or before sunrise. The footage shows the station and its crews, with the presenter.
• DD-259 Not the Space Force: NASA, the National Aeronautics and Space Administration, is the U.S. civilian space agency, established on July 29, 1958. Its Apollo program landed 12 astronauts on the Moon between 1969 and 1972. It also runs robotic missions such as the Mars rovers, Earth-observing satellites and space telescopes including Hubble and, with partners, the James Webb Space Telescope. Its Artemis program aims to return astronauts to the Moon. The U.S. Space Force, by contrast, is a military branch founded in 2019. The footage shows NASA missions and facilities, with the presenter.
• DD-260 Ferromagnetism: Ferrofluid is a liquid containing nanoscale magnetic particles, usually magnetite, coated with a surfactant and suspended in a carrier such as oil. It was invented in 1963 by Steve Papell at NASA as a way to move rocket fuel in weightlessness. In a strong magnetic field the liquid forms spikes, an effect called the normal-field instability. Ferrofluids are used as seals around spinning shafts, including in hard drives, and to cool and damp loudspeakers. The footage shows ferrofluid spiking and flowing, with the presenter.
• DD-261 Be Not Afraid: The Book of Ezekiel in the Hebrew Bible describes a vision of four living creatures, later identified as cherubim. Each has four faces, of a man, a lion, an ox and an eagle, and four wings. Beside each is a wheel 'within a wheel' whose rims are full of eyes, and the wheels move with the creatures. In Christian and Jewish tradition these wheels became associated with the ophanim. The phrase 'Be not afraid', often said by angels in the Bible, is popular in modern 'biblically accurate angel' memes based on these descriptions. The footage shows digital renderings of eye-covered rings and winged figures, with the presenter.
• DD-262 Very Slippery: Snakes move in four main ways: lateral undulation (serpentine movement), rectilinear movement, sidewinding and concertina movement. Lateral undulation, the most common, sends waves along the body that push against bumps and surfaces; the snake's belly scales grip in one direction and slide in the other. On very smooth surfaces there is little to push against, so a snake can thrash without moving forward. The footage shows a pale snake struggling to move on a slick surface, with the presenter.
• DD-263 Type I: The Kardashev scale was proposed in 1964 by the Soviet astronomer Nikolai Kardashev to classify civilizations by energy use. A Type I civilization uses energy on the scale of all that reaches its home planet from its star, about 10^16 to 10^17 watts for Earth; Type II uses the full output of its star; Type III that of a galaxy. Carl Sagan suggested a sliding scale, on which humanity rates about 0.7. The footage shows animated planets and energy imagery, with the presenter.
• DD-264 The Fingers of Death: A brinicle is a hollow tube of ice that grows downward from sea ice in polar waters. As seawater freezes, salt is expelled as very cold, dense brine, which sinks and freezes the less salty seawater around it, forming a tube. If it reaches the seabed, ice can spread across the bottom and trap slow-moving animals such as sea stars and sea urchins. A BBC crew filmed one forming in Antarctica in 2011 for the series Frozen Planet. The footage shows a brinicle growing and spreading, with the presenter.
• DD-265 I Wanted You to Know...: The cardiac cycle is the sequence of contraction and relaxation that pumps blood. It starts in the sinoatrial node, the heart's natural pacemaker, which fires an electrical impulse. The two atria contract and push blood into the ventricles. The impulse then passes through the atrioventricular node and down the bundle of His, and the ventricles contract, pumping blood to the lungs and the rest of the body. The familiar 'lub dub' sound comes from the heart valves closing. The footage is an animated 3D heart.
• DD-266 The Beirut Blast: On August 4, 2020, a large amount of ammonium nitrate stored at the Port of Beirut, Lebanon, exploded. About 2,750 tons had been kept in a port warehouse for years. Reports say the blast was felt in Cyprus, more than 150 miles (240 km) away. More than 200 people were killed, thousands were injured, and about 300,000 people lost their homes. Buildings across the city were damaged and windows shattered. The footage is phone video of the blast from several places in the city.
• DD-267 About to Blow: An eruption becomes explosive when gases dissolved in magma expand rapidly as it nears the surface, shattering the magma into ash and rock that are blasted into the atmosphere. Explosive eruptions can produce pyroclastic flows, fast avalanches of hot gas, ash and rock, as well as ash clouds that threaten aviation and human health. Monitoring volcanoes helps scientists predict eruptions and reduce their impact. The footage shows a lava lake and fountaining lava from above.
• DD-268 The Baobab Tree: Baobabs (genus Adansonia) are known for their massive, swollen trunks and sparse branches. The nine species are native to mainland Africa, Madagascar and Australia, and some trees live for well over 1,000 years. Their trunks store water that helps them survive long dry seasons. Baobab fruit is rich in vitamin C, and the bark fiber can be made into rope and cloth. The footage shows a car driving along an avenue of baobabs.
• DD-269 CASCADE: When a drop of water lands gently on a pool, a thin film of air can keep it from merging at once, so it appears to bounce. It then partly merges, leaving behind a smaller drop, and this repeats in what is called a coalescence cascade until the drop is fully absorbed. Surface tension holds each drop's shape between the stages. The footage is a slow-motion lab recording of a drop falling from a needle.
• DD-270 Kiloton: After World War II, the United States conducted nuclear tests at Bikini Atoll in the Marshall Islands. Operation Crossroads in 1946 included the Baker test on July 25, 1946, in which a 23-kiloton atomic bomb was detonated underwater to study effects on naval vessels. It threw up a huge column of water and caused severe radioactive contamination. Bikini's residents had been relocated before the tests and have not resettled the atoll permanently. The footage shows the Baker test.
• DD-271 Oxidized Aluminum: Aluminum is normally protected by a thin oxide layer. Mercury disrupts that layer by forming an amalgam, so the exposed aluminum oxidizes rapidly in air, growing white fibers of aluminum oxide in an exothermic reaction. The process weakens the metal, which is why mercury is kept away from aluminum structures such as aircraft. The footage shows mercury placed on an aluminum plate and the fibrous growth that follows.
• DD-272 Flying Fishermen: Bald eagles and African fish eagles are celebrated as fishers and national emblems, but both also take food by kleptoparasitism, stealing catches from other birds. The bald eagle's comeback from near-disappearance in the contiguous United States is one of the best-known conservation recoveries.
• DD-273 What Are You Waiting For?: An avalanche is a mass of snow sliding rapidly down a slope. It can be triggered by heavy snowfall, temperature changes or people. The Reel says avalanches can reach 80 miles per hour; typical slab avalanches do, and large powder avalanches can be faster. An avalanche can bury people, destroy buildings and flatten forests. For people caught in one, the main dangers are burial, traumatic injury and hypothermia. The footage shows a large avalanche filmed from a rocky slope.
• DD-274 You're Spinning Me Around: A gyroscope is a spinning wheel or rotor mounted so its axis can point in any direction. While it spins, it resists changes to the direction of its axis because of the conservation of angular momentum, so it can balance at odd angles and keep its orientation as its base moves. The same principle is used in navigation instruments. The footage shows a toy gyroscope balancing in several positions.
• DD-275 Synaptic Transmission: Neurons communicate at synapses, junctions between two nerve cells. When an action potential reaches the end of the presynaptic neuron, it triggers the release of neurotransmitters from vesicles. They cross the synaptic cleft and bind to receptors on the postsynaptic neuron, opening ion channels. Depending on the neurotransmitter and receptor, the effect excites or inhibits the next neuron. The footage is an animation of a synapse.
• DD-276 Bark Beaters: The white-bellied woodpecker is a large woodpecker of South and Southeast Asia. It is mostly black with a white belly, and males have a red crown. It drums on trees to communicate and digs into wood for insects. Its nest cavities are later used by other animals, and its need for mature forest makes it a sign of forest health. The footage shows white-bellied woodpeckers on tree trunks.
• DD-277 We Create Our Own Demons: Iron Man 3, directed by Shane Black, was released in the U.S. on May 3, 2013, as the first film of Phase Two of the Marvel Cinematic Universe. Robert Downey Jr. plays Tony Stark, who struggles with anxiety after the events of The Avengers. Its twist about the Mandarin divided fans. The film earned about $1.2 billion worldwide. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-278 To Be Worthy: Thor: The Dark World, directed by Alan Taylor, was released in the U.S. on November 8, 2013, as the second film of Phase Two of the Marvel Cinematic Universe. Chris Hemsworth's Thor faces the Dark Elf Malekith, who wants to use the Aether to plunge the universe into darkness, and Tom Hiddleston returns as Loki. Critics praised the effects but often faulted the villain and plot. The film earned about $645 million worldwide. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-279 BUCKY?!?!?: Captain America: The Winter Soldier, directed by Anthony and Joe Russo, was released in the U.S. on April 4, 2014, in Phase Two of the Marvel Cinematic Universe. Chris Evans returns as Steve Rogers, who uncovers that HYDRA has infiltrated S.H.I.E.L.D., while Sebastian Stan plays the brainwashed assassin revealed to be Bucky Barnes. The film drew on 1970s political thrillers and earned about $714 million worldwide. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-280 Rise of the Star-Lord: Guardians of the Galaxy, written and directed by James Gunn, was released in the U.S. on August 1, 2014. Chris Pratt stars as Peter Quill, or Star-Lord, leading a team with Gamora (Zoe Saldaña), Drax (Dave Bautista), Rocket (voiced by Bradley Cooper) and Groot (voiced by Vin Diesel). Its soundtrack of 1960s and 1970s songs, Awesome Mix Vol. 1, reached No. 1 on the Billboard 200. The film earned about $773 million worldwide. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-281 No Strings On Me: Avengers: Age of Ultron, written and directed by Joss Whedon, was released in the U.S. on May 1, 2015. The Avengers face Ultron (voiced by James Spader), an artificial intelligence created by Tony Stark and Bruce Banner that turns on humanity. It introduced Wanda Maximoff (Elizabeth Olsen), Pietro Maximoff (Aaron Taylor-Johnson) and Vision (Paul Bettany). It earned about $1.4 billion worldwide. The title echoes Ultron's line 'There are no strings on me'. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-282 A MOVIE FOR ANTS: Ant-Man, directed by Peyton Reed, was released in the U.S. on July 17, 2015, closing Phase Two of the Marvel Cinematic Universe. Paul Rudd plays Scott Lang, an ex-convict recruited by scientist Hank Pym (Michael Douglas) to wear a suit that shrinks him to insect size, alongside Hope van Dyne (Evangeline Lilly). The film is structured as a heist and earned about $519 million worldwide. The Reel is a review with clips; the opinions in it are the Reel's.
• DD-283 The Opening Ceremony: The Olympic opening ceremony marks the start of each Games, with performances that showcase the host nation's culture and history, the parade of athletes and the lighting of the cauldron. Each ceremony is designed by the host. I posted this Reel two days after the Paris opening ceremony on July 26, 2024. The footage shows the fou drummers from the opening ceremony of the 2008 Beijing Olympics.
• DD-284 OVER 0: Mechanical calculators divide the way people do long division: by subtracting the divisor over and over and counting the subtractions. With a divisor of zero, each subtraction takes nothing away, so the count never ends. Some machines simply keep cycling, carriage and counters spinning, until the operator stops them by hand. Others jam or trip a stop. That behavior is a physical version of why division by zero is undefined in arithmetic: no number multiplied by zero gives a nonzero result, so there's no answer to find. Desktop mechanical calculators were common office tools from the late 1800s until electronic calculators replaced them in the late 1960s and early 1970s. The footage shows a mechanical calculator's carriage and keys in motion, with a hand at the controls.
• DD-285 Feeling Salty: Sodium is a soft alkali metal that reacts with water to form sodium hydroxide (caustic soda) and hydrogen gas, giving off heat. With larger pieces, that heat can ignite the hydrogen. A 2015 study in Nature Chemistry, filmed with high-speed cameras, suggested the violent start isn't just burning hydrogen: the metal loses electrons to the water so fast that the remaining positively charged metal ions repel each other and the surface bursts apart, a Coulomb explosion, exposing fresh metal. The title nods to table salt, sodium chloride, where sodium is tame and bound to chlorine. The footage shows a lump of metal thrown into a pond, then white bursts and spray on the water.
• DD-286 Newtons Cradle: Newton's cradle is a row of identical metal balls hung from a frame so they just touch. Lift and release one end ball, and after the collision the ball at the far end swings out while the middle ones stay almost still. Pull two, and two swing out. The pattern follows from conservation of momentum and of kinetic energy in nearly elastic collisions: one ball leaving at the same speed is the outcome that satisfies both. Small losses to sound, heat and air resistance make the swings die down. The device is named after Isaac Newton, whose laws explain it, but it's credited to the 17th-century French scientist Edme Mariotte. The footage shows a classic desk cradle with five balls clicking back and forth.
• DD-287 Making Plasma in the Microwave: Plasma is gas in which enough atoms have lost electrons that it conducts electricity and glows. In a microwave oven, plasma usually starts where the field gets concentrated: at sharp metal edges, or in the gap between two grape halves. A 2019 study in PNAS showed the grape effect comes from the fruit acting as a resonator; water-rich spheres trap the microwaves and build a hotspot where they touch, which ionizes the surrounding air. A match flame can do the same by supplying already-ionized gas. Once started, the plasma absorbs microwave energy, rises as a glowing ball and can damage the oven, so I'd treat it as a demonstration, not a kitchen trick. The footage shows a bright, flickering plasma ball inside an inverted glass in a microwave.
• DD-288 No Perfect Crystallizations: A snow crystal starts when supercooled cloud droplets freeze onto a tiny particle such as dust or pollen, and then grows as water vapor deposits directly onto the ice. Ice's crystal structure gives it six-fold symmetry, so crystals grow as hexagonal plates, columns or branching stars. Which shape wins depends on temperature and humidity, so as a crystal tumbles through changing conditions, each stage leaves its mark on its arms. Caltech physicist Kenneth Libbrecht, who grows snow crystals in the lab, explains that complex flakes are almost certainly never identical because of the huge number of possible growth paths, though very simple crystals can look alike, and researchers have grown 'identical-twin' crystals side by side under matched conditions. The footage shows a time-lapse of a crystal growing branches.
• DD-289 The Ghost Mushroom: The ghost fungus, Omphalotus nidiformis, is a bioluminescent mushroom found mainly in southern Australia and Tasmania, with reports from India in 2012 and 2018. Its fan- or funnel-shaped caps grow in overlapping clusters on dead or dying wood, often eucalypts, and give off a soft green glow in the dark. Fungal bioluminescence comes from an enzyme, luciferase, oxidizing a luciferin molecule. English naturalist Miles Joseph Berkeley first described it in 1844 as Agaricus nidiformis, from material collected by the Scottish naturalist James Drummond. It resembles edible oyster mushrooms but is poisonous: not lethal, but eating it causes severe cramps and vomiting, which are attributed to compounds called illudins. The footage shows clusters of green-glowing mushrooms on a tree at night.
• DD-290 An MRI's Skeleton: The machine in the footage is almost certainly a CT (computed tomography) scanner with its covers off, not an MRI. In a CT scanner, an X-ray tube and detector array are mounted on a ring-shaped gantry that spins rapidly around the patient, and a computer turns the measurements into cross-sectional images. An MRI works differently and has no spinning parts. A strong static magnet lines up hydrogen nuclei in the body, radio-frequency pulses tip them, and stationary gradient coils briefly vary the magnetic field so the signals can be located in space. The nuclei give off radio signals as they relax, and a computer builds images in which tissues differ by how fast they relax. The Reel's description of magnets, radio waves and gradient fields fits MRI; only the 'spinning' parts and the footage belong to CT.
• DD-291 Amazing Underwater Forests: Kelp forests are dense stands of large brown algae (kelp) that grow in cool, shallow, nutrient-rich coastal waters. NOAA notes that kelp can grow up to 18 inches (45 cm) a day in ideal conditions and is rarely found deeper than about 15 to 40 m. Giant kelp (Macrocystis) can grow 30 to 60 cm vertically per day and form a floating canopy at the surface. The forests shelter and feed fish, invertebrates and marine mammals. Kelp is an alga, not a true plant, and like other seaweeds it takes up carbon dioxide as it grows. The footage shows divers' views of tall kelp fronds with fish swimming among them.
• DD-292 Totally Radula!: Velvet worms (Onychophora) are soft, many-legged invertebrates of humid tropical and southern temperate forests. They hunt small invertebrates by squirting a sticky slime from glands near the head that hardens and traps the prey, then inject saliva and eat it. There are two living families, Peripatidae and Peripatopsidae, and species range from tiny to the largest known, Mongeperipatus solorzanoi of Costa Rica, at about 22 cm. Velvet worms live in Southeast Asia, but I couldn't verify a species called the 'giant red velvet worm' there or the 20 cm figure for it. The title's 'radula' is a pun: a radula is a mollusk's rasping tongue, which velvet worms don't have; they bite with jaws. The footage shows a reddish velvet worm walking over moss.
• DD-293 Worms This Flat: Marine polyclad flatworms (Polycladida) are thin, often brightly patterned flatworms found mostly on reefs and rocky shores. They glide on beds of cilia and muscular waves, and most are carnivores that eat small invertebrates such as sea squirts, snails and crustaceans. Some species' bright colors are thought to warn predators that they're distasteful or toxic. The famous experiments where a flatworm is cut into pieces and each regrows into a whole animal mostly involve freshwater planarians, which carry stem cells called neoblasts. The footage shows several colorful marine flatworms rippling over coral and rock.
• DD-294 A Web of Wonder: Spiders make silk in abdominal glands and draw it out through spinnerets at the rear of the abdomen. Different glands make different silks: dry, strong dragline silk for frames and radii, and gluey capture silk for the spiral that holds prey. An orb weaver typically lays a bridge line, builds a frame and radii, puts in a temporary spiral, then replaces it with the sticky capture spiral. Spider silk combines high strength with stretch, so it absorbs the energy of flying insects. Web shapes vary by family, from orb webs to sheet webs and funnel webs, and web building is largely innate. The footage shows an orb weaver spinning its web.
• DD-295 2-Billion Dollar B=2: The Northrop B-2 Spirit is a US Air Force stealth bomber with a flying-wing shape designed to reduce its radar cross-section. It first flew publicly in 1989. By 1996, the program had produced 21 B-2s at a total cost of $44.7 billion, an average of $2.13 billion per aircraft when research and development are included. The cost of building each additional aircraft, without development, has been estimated at about $737 million in 1997 dollars. Plans for 132 aircraft were cut back as the Cold War ended, which raised the per-plane share of development costs. The B-2 is being succeeded by the Northrop Grumman B-21 Raider. The footage shows a B-2 in flight and close-ups of its wing.
• DD-296 Is Water Sticky?: Water molecules attract one another through hydrogen bonds. At the surface, molecules have neighbors only below and beside them, so they're pulled inward, and the surface behaves like a stretched film. That's surface tension, and water's is high for a liquid, about 72 millinewtons per meter at room temperature. Attraction between like molecules is called cohesion; attraction to other surfaces, like glass or a plant's xylem walls, is adhesion. Together they drive capillary action. Surface tension shapes drops, lets some insects stand on water and dominates fluid behavior in microgravity, where water forms floating spheres. The footage shows water beading on a coin and drops on surfaces.
• DD-297 NUCLEAR DISASTER: On April 26, 1986, Reactor 4 at the Chernobyl Nuclear Power Plant exploded and burned, in the Soviet Union's Ukrainian SSR, now The Ukraine. During the accident, molten fuel, cladding, concrete and sand mixed into a lava-like material called corium that flowed into rooms beneath the reactor. The best-known mass, the Elephant's Foot, was found in December 1986 in a maintenance corridor below the reactor's remains. Measurements then put its surface at roughly 8,000 to 10,000 roentgens per hour, enough to deliver a 50/50 lethal dose in a matter of minutes. Its radioactivity has fallen a great deal since, but it remains hazardous, and the site sits inside the New Safe Confinement arch completed in 2016. The footage shows photos from inside the plant and the corium mass.
• DD-298 Liquid Rock: Lava is molten rock erupted at the surface; underground, the same material is called magma. Most magma forms in the upper mantle, and a key way rock melts there is decompression: as hot mantle rises, the pressure on it drops and it partly melts, which is why mid-ocean ridges and hotspots such as Iceland and Hawaii are so volcanic. Erupted lava typically ranges from about 700 to 1,200 °C (1,300 to 2,200 °F). Runny basaltic lava can travel quickly, while silica-rich lava is thick and slow. As it cools, lava can crack into hexagonal basalt columns or build up islands. The footage is drone video of lava fountaining and flowing in Iceland.
• DD-299 Iceberg Blue: Glacier ice forms as snow is buried and compressed over years, squeezing out air bubbles. Ice and water absorb a little more red light than blue, so over long paths through clear ice, red is removed and the light that comes back looks blue. Snow and bubbly ice look white because countless surfaces scatter all colors before much is absorbed. So deep, dense, bubble-free ice in a glacier or iceberg looks the most blue. The footage shows a glacier front calving blue ice into the sea.
• DD-300 A Real Hot Head: A safety match head typically contains potassium chlorate as an oxidizer, sulfur and other fuels, ground glass for friction and a binder. The striking strip on the box holds red phosphorus and powdered glass. When the match is struck, friction converts a tiny amount of red phosphorus into white phosphorus, which ignites in air; that heat starts the potassium chlorate decomposing to release oxygen, which burns the sulfur and other fuels in the head and then lights the wood or paper stick. Strike-anywhere matches carry phosphorus sesquisulfide in the head itself. The footage shows close-ups of a match head igniting.
• DD-301 Video Trickery: Many CMOS image sensors use a rolling shutter: instead of capturing every pixel at the same instant, they read the frame out row by row, usually top to bottom. When something moves fast during that readout, or the camera itself moves, each row records it at a slightly different moment. The result is skew, wobble ('jello') or strange shapes, like propeller blades that look curved or detached, and flashes that light only part of a frame. A global shutter exposes all pixels at once and avoids this. The footage shows spinning blades and strings distorted on camera.
• DD-302 Linking Up: Inside thunderstorms, collisions between ice crystals, graupel (soft hail) and supercooled droplets in strong updrafts separate electric charge. Typically the upper cloud becomes positively charged and the middle to lower region negatively charged. When the charge difference grows large enough, the air breaks down and a lightning discharge flashes within the cloud, between clouds, or to the ground. The channel heats the air to around 50,000 °F, and the sudden expansion makes thunder. The footage alternates storm clouds lit by lightning with a dish of metal balls in oil that line up into chains under high voltage, a demonstration of charges linking up, which I read as an exemplar, not lightning itself.
• DD-303 Knuckle Coupling: The knuckle coupler, originally the Janney coupler, was patented by Eli H. Janney, a Confederate veteran of the American Civil War, in US patent 138,405 on April 29, 1873. Each coupler has a hinged knuckle; when two cars are pushed together, the knuckles swing closed and lock automatically, and a lever lets workers uncouple without stepping between the cars. Before that, link-and-pin couplers required a worker to stand between moving cars to drop a pin, and injuries were common. The Safety Appliance Act of 1893 required automatic couplers on US railroads. Railroads standardized on Janney's mating profile, and coupling accidents fell from 11,710 in 1893 to 2,256 in 1902 even as the workforce grew. Knuckle couplers remain standard in North America. The footage shows a coupler's knuckle opening and closing in close-up.
• DD-304 Getting to the (Ball)Point: A ballpoint pen dispenses thick, oil-based ink over a hard ball, usually steel, brass or tungsten carbide, seated in a socket at the tip. As the ball rolls across the paper, it picks up ink from the reservoir on one side and lays it down on the other, while also acting as a cap that keeps the ink inside from drying out. John J. Loud patented a ballpoint on October 30, 1888, for marking leather, but it was too coarse for letters. Hungarian newspaper editor László Bíró, noticing that newspaper ink dried fast and didn't smudge, developed a pen with viscous ink and filed for a British patent on June 15, 1938. He and his brother György later moved to Argentina, where their pens went on sale. The footage shows close-ups of pen tips, the ball and a pen being machined.
• DD-305 A Prison for Your Mind: As of 2024, virtual prisons are a speculative idea, not a system any prison uses. The footage comes from 'Cognify', a concept video that Berlin-based filmmaker and science communicator Hashem Al-Ghaili posted on June 24, 2024. His concept goes further than the Reel's VR headsets: it imagines AI-generated artificial memories implanted into a prisoner's brain so that years of rehabilitation could be experienced in minutes, including seeing a crime from the victim's perspective. Al-Ghaili told Dazed he was motivated by problems such as overcrowding, false imprisonment and ineffective rehabilitation. Snopes reported in 2025 that no such technology exists; implanting false memories has only been shown in a basic form in mice. Commentators also raised ethical concerns about consent and the collection of prisoners' brain data. The footage shows a person in a headset strapped to a chair, with computer-generated scenes.
• DD-306 A REEL Deep Dive: Female deep-sea anglerfish have a bioluminescent lure, called an esca, on a modified dorsal fin spine that extends over the head. The glow attracts prey in the dark depths. When prey comes close, the anglerfish opens its large, hinged jaw and swallows it whole in an instant. The footage shows an anglerfish on the seafloor.
• DD-307 Microscopic Extremophiles: Tardigrades were first described in 1773 and named 'slow walkers' three years later; about 1,500 species are known. Researchers have exposed them to space on the FOTON-M3 mission, and a capsule of dried tardigrades crashed on the Moon with the Beresheet lander, while proteins such as Dsup help explain how they shield their DNA.
• DD-308 Flaming Jellies: The flame jellyfish (Rhopilema esculentum) is a large jellyfish of coastal waters off China, Korea and Japan. Its bell is translucent with a reddish-brown tint, and it trails tentacles armed with stinging cells to catch plankton. It is not considered seriously dangerous to people and is harvested as food in East Asia. The footage shows flame jellyfish swimming.
• DD-309 Bacteria Hunters: Bacteriophages are the most abundant biological entities on Earth, discovered independently by Frederick Twort in 1915 and Félix d'Hérelle in 1917. Phage therapy faded in the West with antibiotics but continued in Georgia and Russia, and drug-resistant infections have revived interest in it despite the challenge of matching each phage to a specific strain.
• DD-310 Underwater Angels: Sea angels (order Gymnosomata, part of the pteropods) are small, shell-less marine snails. Their translucent, gelatinous bodies carry two wing-like flaps that they beat to swim. They live in cold seas, from the surface to deeper water, and feed mainly on shelled pteropods called sea butterflies. The footage shows sea angels swimming.
• DD-311 Leaf Home in the Sky: Baya weavers are small, sociable birds of South and Southeast Asia. Males weave hanging, retort-shaped nests from strips of grass and palm leaves, often building several to attract females. The nests hang from branches and have a long, downward-facing entrance tube that helps keep predators out. The footage shows baya weavers at their nests.
• DD-312 Advanced Bicycle Riding: Urban riding uses city features such as stairs, railings, ledges and benches for tricks, jumps and technical lines. It draws on mountain bike trials and BMX street riding and is known for self-expression. The footage is a rider's point-of-view clip descending long outdoor staircases.
• DD-313 "Writing" Life: Transcription is the first step of gene expression and a major control point for it. It is error-prone compared with DNA copying, needs many helper proteins in complex cells, and is the target of antibiotics such as rifampicin; its molecular basis in eukaryotes earned Roger Kornberg the 2006 Nobel Prize in Chemistry.
• DD-314 Toxic Phosphorus: White phosphorus is a waxy, toxic form of the element that can ignite spontaneously in air at around 30 °C (86 °F). It burns with a bright flame and gives off dense white smoke of phosphorus pentoxide, so it is stored under water. It is used to make phosphoric acid and other chemicals, and militaries have used it in smoke and incendiary munitions, a use regulated by international law. Contact causes severe burns. The footage shows the chemist from Nile Red handling and burning it.
• DD-315 Your Heart in a Glass: Cardiomyocytes are the muscle cells of the heart. They can generate and conduct electrical impulses, and their myofibrils of actin and myosin let them contract. Neighboring cells are joined by intercalated discs, which pass electrical signals quickly so the heart contracts together. Lab-grown cardiomyocytes can beat by themselves in a dish. The footage shows beating heart cells under a microscope.
• DD-316 Glacial Waterfalls: Glacial waterfalls form where meltwater from a glacier flows over a cliff or the ice edge. In warm seasons, faster melting makes the falls bigger. Meltwater carries fine ground rock, called rock flour, which gives it a milky look. The footage shows a meltwater river cutting across an ice sheet and pouring over an ice cliff.
• DD-317 Sharpening Your Mind: Before sharpeners, pencils were whittled with knives. The French mathematician Bernard Lassimone patented a pencil sharpener in 1828, and many hand-operated designs followed in the 19th century. Rotary sharpeners use gear-driven helical cutters that turn around the pencil, giving a long, even point. The footage shows an old mechanical sharpener being restored and tested.
• DD-318 To Break the Ice: Icebreakers are ships built to clear paths through sea ice. Their sloped, reinforced bows let them ride up onto the ice so the ship's weight breaks it, and strengthened hulls protect them from damage. They keep polar shipping routes and research expeditions moving. The footage shows a red-hulled icebreaker pushing through pack ice.
• DD-319 The Strings of Fate: String theory proposes that particles are tiny vibrating strings. Superstring theories require 10 spacetime dimensions, and M-theory, which links them, requires 11. Beyond the three dimensions of space and one of time, the extra dimensions are thought to be compactified, curled up at scales far too small to detect. String theory remains untested by experiment. The footage is an animated tesseract and other higher-dimensional shapes.
• DD-320 Synthetic Conception: In vitro fertilization (IVF) fertilizes an egg with sperm outside the body. The ovaries are stimulated to produce several eggs, which are collected in a minor procedure and combined with sperm in the lab, sometimes by injecting a single sperm into the egg. Embryos are grown for a few days, and one or more are transferred to the uterus. The first IVF baby, Louise Brown, was born on July 25, 1978, and more than 10 million babies have since been born through IVF. The footage shows microscope views of eggs, sperm and early embryos.
• DD-321 The Hills Have Lungs: In very strong winds, trees sway hard enough that their shallow root plates lift and drop, raising and lowering the soil and moss on top of them. On video the forest floor seems to breathe. The motion is a sign of stress that can end in a tree being uprooted. The footage shows a forest floor heaving during a windstorm.
• DD-322 They Don't Age!: Hydras are freshwater animals a few millimeters long, with a tubular body and a mouth ringed by stinging tentacles that catch tiny prey. They can regenerate a whole body from a small fragment. Studies of Hydra vulgaris found that its death rate does not rise with age, so it shows no measurable aging, which makes it a model for research on regeneration and longevity. The footage shows a hydra under a microscope.
• DD-323 Dredging Up the...Ground?: Dredging ships remove sediment and debris from the bottoms of rivers, harbors and seas. They keep waterways navigable, deepen shipping channels and can reclaim land from the sea. They work with suction pipes, mechanical buckets or cutter heads. The footage shows a dredger's hopper and land reclamation; the on-screen credit is Eko Atlantic, a city being built on reclaimed land in Lagos, Nigeria.
• DD-324 Ectogenesis: Ectogenesis means growing an embryo or fetus outside the body. Research focuses on artificial wombs for extremely premature babies: in 2017 a Philadelphia team kept premature lambs alive for weeks in a fluid-filled 'biobag' that supplied oxygen and nutrients. No artificial womb has been used for human babies as of the Reel's posting. The footage, with rows of pods, comes from EctoLife, a 2022 concept video by Hashem Al-Ghaili; it is not a real facility.
• DD-325 Solid Snake: The western bush viper (Atheris chlorechis) is a small, tree-dwelling viper of West African rainforests. Its green to yellowish scales camouflage it among leaves, and adults usually measure about 50 to 70 centimeters (20 to 28 inches). Its venom causes pain, swelling and tissue damage; bites to humans are rare but need medical care. The footage shows a green bush viper on branches.
• DD-326 Preserve Your Bubbles: When a soap bubble is blown in air well below freezing, the thin water film begins to freeze. Ice crystals form and spread across the surface in branching patterns, swirled by currents in the film, until the bubble becomes a fragile frozen shell. Very low temperatures help the whole bubble freeze before it pops. The footage shows bubbles freezing outdoors on a snowy day.
• DD-327 The Googol Gears: A googol is 1 followed by 100 zeros. Daniel de Bruin built a gear machine to make that number tangible: a chain of 100 gear stages, each reducing speed by a factor of ten, driven by a hand crank. The first gear spins freely, but the final gear would need a googol turns of the crank to rotate once, far longer than the age of the universe at any practical speed. The footage shows the long row of gears.
• DD-328 Squaring the Circle: A sphere built from cubes, like a voxel model, can only approximate the curve: flat faces and square edges never match a continuous surface. Using more, smaller cubes makes the shape smoother, but some stair-stepping always remains. The title echoes the classic problem of squaring the circle with compass and straightedge, which Ferdinand von Lindemann proved impossible in 1882. The footage is an animation of block spheres with ever smaller cubes.
• DD-329 The Secret of Compact Disks: A compact disc stores digital data along a spiral track of microscopic pits and flat areas called lands. A laser in the player shines on the track, and a sensor detects changes in the reflected light. In the CD format, each transition between a pit and a land represents a 1, and stretches without a transition represent 0s. The footage shows close-ups of a disc surface and its pits.
• DD-330 Nuclear Shadows: When the United States dropped atomic bombs on Hiroshima on August 6, 1945, and Nagasaki on August 9, 1945, the intense flash of thermal radiation bleached and scorched exposed surfaces. Where a person or object blocked the flash, the surface behind stayed darker, leaving a shadow-like outline. Some of these shadows, on steps, walls and pavements, are preserved; the best known is on the steps of a Hiroshima bank. The footage shows such shadows and a re-enactment of how they form.
• DD-331 Coal World: Coal dust blowing from loaded rail cars and stockpiles is a health, safety and maintenance problem. Railroads and mines use spray stations that coat coal with water or chemical binding agents, often called toppers, as trains roll through, forming a crust that reduces dust. Dust control also lowers the risk of coal-dust fires and explosions in enclosed spaces. The footage, credited to BNSF Railway, shows coal trains passing through a spray station.
• DD-332 See Right Through Me: Borosilicate glass such as Pyrex has a refractive index of about 1.47, close to that of many vegetable oils. When the glass is submerged, light passes from oil to glass with almost no bending or reflection, so the edges our eyes use to see the glass nearly vanish. The footage shows Pyrex objects disappearing as they are lowered into oil.
• DD-333 Embryonic Development: Early embryos split into many cells without getting bigger, and the pattern of those divisions depends largely on how much yolk the egg holds. Gastrulation then sorts cells into three germ layers, and genes such as the Hox family help give each body segment its identity.
• DD-334 Anatomy of a Combustion Engine: In a four-stroke internal combustion engine, a piston draws in fuel and air, compresses it, and in gasoline engines a spark plug ignites it; diesel engines ignite the mixture by compression alone. The expanding gas pushes the piston down, turning the crankshaft, and the exhaust stroke clears the cylinder. The footage shows cutaway views of an engine and ignition in slow motion.
• DD-335 Smelly Smell That Smells Smelly: Bromine is a reddish-brown liquid halogen that evaporates readily into a choking, foul-smelling vapor; its name comes from the Greek for stench. The vapor irritates the eyes and airways and can damage the lungs, and liquid bromine causes painful skin burns. It must be handled in well-ventilated spaces with protective gear. The footage, from NileRed, shows bromine being handled in the lab.
• DD-336 Slime Talk: Slime molds are neither fungi nor animals; most are amoeba-like organisms. Some live as single cells that gather into a multicellular mass when food runs short, while others, such as Physarum polycephalum, grow as one giant cell with many nuclei. In a 2000 experiment, Toshiyuki Nakagaki and colleagues showed that Physarum could find the shortest route through a maze to food. The footage, credited to the BBC, shows yellow slime molds spreading.
• DD-337 Count It Up: A banknote counter feeds bills one at a time through rollers past sensors that register each note, and many measure size or thickness to catch doubles. Higher-end models check ultraviolet and magnetic features to flag counterfeits and can sort mixed denominations. Machines like these count hundreds to more than a thousand notes a minute. The footage shows a counter riffling through a stack of bills.
• DD-338 Quantum Shenanigans: The Schrödinger equation, published by Erwin Schrödinger in 1926, is a central equation of quantum mechanics. It describes how a system's wave function evolves over time; the square of the wave function's magnitude gives the probability of finding a particle in a given place. The footage shows animations of waves and particles.
• DD-339 Professional Capping: The Reel describes crews putting out gas fires by lowering a heat-resistant steel dome over the flames with heavy machinery, cutting off oxygen so the leak can then be capped or vented. Firefighting for wells and gas lines also uses water, chemicals and, for large well fires, explosives, before a cap is fitted. The footage shows a dome being lowered onto a fire.
• DD-340 Boeing's Red Rain: The 747 Supertanker was a Boeing 747 converted into an aerial firefighting tanker. It could carry up to 19,200 U.S. gallons of water or fire retardant, the largest load of any firefighting aircraft, and fought fires in the U.S., Chile, Israel and Bolivia. The last one, the Global SuperTanker, ended operations in 2021. The footage is a computer-generated animation of the jet dropping red retardant.
• DD-341 A Step Up: Stairs are among the oldest architectural structures, thought to be about 8,000 years old, with spiral stairs dating to at least the 400s BC. The popular idea that castle spirals were built clockwise to hinder right-handed attackers is a misconception, while double-helix designs and impossible-object drawings show how far the form has been pushed.
• DD-342 Leech Gourmet: Not all leeches drink blood. Some land and freshwater leeches are predators that hunt earthworms and other invertebrates, seizing prey and swallowing it whole or sucking out its fluids. The Reel names Haemadipsa picta, the tiger leech, which is usually described as a blood-feeder, so I attributed the species claim to the Reel. The footage shows a leech consuming an earthworm.
• DD-343 JUMP!: Peacock spiders (genus Maratus) are tiny Australian jumping spiders, most only about 4 to 6 millimeters long. Males raise a brightly colored flap on the abdomen, like a peacock's tail, and court females with leg waves, vibrations and side-to-side steps. Females may attack males whose display fails to impress. The footage shows a male displaying.
• DD-344 Red Cat | Oil Rig: When copper metal is placed in silver nitrate solution, copper atoms lose electrons and enter solution as copper(II) ions, turning it blue, while silver ions gain electrons and deposit as solid silver crystals. It is a single-displacement redox reaction. The title combines two mnemonics: "red cat" (reduction at the cathode) and "OIL RIG" (oxidation is loss, reduction is gain). The footage shows silver crystals growing on a copper coil.
• DD-345 Sudsy: Soap is made by saponification, reacting fats or oils with a strong base to make fatty acid salts and glycerol. Each soap molecule has a water-attracting head and an oil-attracting tail. In water the tails gather around grease and germs, forming micelles with the dirt inside, which rinse away. The footage shows microscope imagery.
• DD-346 Mach Madness: When a jet flies fast through humid air, air pressure and temperature drop over the wings and around the airframe, and water vapor condenses into a visible cloud, often called a vapor cone. It is common near the speed of sound but can form at subsonic speeds, and it is not itself the shock wave or proof of breaking the sound barrier. Engine contrails are a different effect. The footage shows fighter jets with vapor around the wings, often low over the sea.
• DD-347 Shatter & Collide: A spinning disc is stretched by rotational stress that grows with speed. Polycarbonate CDs are built for drive speeds up to roughly 10,000 rpm; beyond their limits, or when cracked, they can shatter violently, and fast CD-ROM drives occasionally broke damaged discs. Many drives cap speed partly for this reason. The footage shows a CD on a motor spinning until it shatters.
• DD-348 The Golden Ellipse: Patek Philippe introduced the Golden Ellipse watch in 1968, with a case shaped between an oval and a rectangle based on the golden ratio. The Reel describes making its bracelet: designers sketch it to suit the case, prototypes test fit, precious metal is cut into strips and formed into links, and the links are assembled so the bracelet flexes on the wrist. The footage shows metal links being shaped and assembled.
• DD-349 Hyalophora cecropia: The cecropia moth (Hyalophora cecropia) is North America's largest native moth, with a wingspan of up to about 6 inches (15 cm), sometimes more. It belongs to the family Saturniidae, the giant silk moths, and has reddish-brown wings banded in white, red and black. Adults have no functional mouthparts and live only a week or two on energy stored as caterpillars. The footage shows adult moths.
• DD-350 The Harvest: A combine harvester cuts crops such as wheat, corn and soybeans and separates grain from chaff, while forage harvesters chop whole plants. Trucks or tractor-drawn carts drive alongside, catching the crop from the spout so the harvester keeps working. Modern harvesters monitor yield as they go. The footage shows a harvester filling trucks in a field.
• DD-351 Cliffside Honey Heist: In mountainous parts of China, Nepal and elsewhere in Asia, honey hunters harvest wild honeycombs from colonies on steep cliffs, often those of giant honeybees. The Reel describes the practice in Yunnan and Sichuan: climbers rappel or use ropes and ladders, then cut the comb with long poles. The honey is valued locally for its flavor. The footage shows climbers removing comb from a cliff hive.
• DD-352 Propping Up the Coastline!: Mangroves grow along tropical and subtropical coasts. Their tangled above-ground prop roots and dense vegetation create friction that slows water and absorbs wave energy, reducing erosion and protecting shorelines and settlements from storm surge. The footage shows waves passing through a mangrove stand.
• DD-353 Supercar Spitting: Flames from a car's exhaust come from unburned fuel igniting in the hot exhaust system. It happens most when a driver lifts off the throttle or shifts hard, and some performance cars and tunes deliberately add fuel or retard ignition timing to create pops, bangs and flames. The footage shows supercars shooting flames from their exhausts at night.
• DD-354 To Bill a Mogging Bird: The shoebill (Balaeniceps rex) is a large, stork-like wading bird of central and eastern African swamps, in countries including Uganda, Zambia, South Sudan and the Democratic Republic of the Congo. It is named for its huge, shoe-shaped bill, which the Reel puts at up to about 9.4 inches (24 cm). Shoebills stand very still before lunging at prey such as lungfish. The footage shows shoebills staring at the camera.
• DD-355 The Hyperion Sled: Philip Bono, an engineer at Douglas Aircraft, proposed Hyperion in the 1960s as a reusable single-stage launcher. It would ride a rocket-powered sled along a long track to gain speed horizontally, saving propellant before climbing to orbit. It was never built. The footage shows rocket sled tests and an animation of a launch.
• DD-356 Computer Wave Control: A standing wave forms when two waves of equal amplitude and frequency travel in opposite directions and interfere. Points that never move are nodes and points of maximum motion are antinodes. Computer-controlled wave generators in test tanks and wave pools can time their paddles precisely enough to build these patterns. The footage shows a pool with synchronized wave makers.
• DD-357 Woolly Monkeys: Woolly monkeys (genus Lagothrix) live in the rainforests of northwestern South America, including Colombia, Ecuador, Peru and Brazil. Their thick, woolly fur ranges from brown to black, and their prehensile tails grip branches like an extra hand. They eat mostly fruit plus leaves and insects, and live in social groups that the Reel puts at 10 to 30 animals. The footage shows woolly monkeys up close.
• DD-358 DANGEROUSLY Reactive: Aluminum reacts vigorously with liquid bromine, often after a short delay while the metal's oxide layer is breached. The highly exothermic reaction produces sparks, flames and fumes of aluminum bromide. Aluminum gives up electrons and bromine accepts them. The footage shows aluminum foil reacting in a dish of bromine.
• DD-359 Earth Movers I: The Caterpillar 793F is an off-highway haul truck for mining and large construction projects, with a payload class of about 250 short tons (roughly 227 metric tons). Its large diesel engine and heavy-duty frame let it carry rock and dirt over rough haul roads. The footage, credited to timothyrinehart, shows a 793F at work.
• DD-360 Thrust: The Space Shuttle flew 135 missions from 1981 to 2011, launching Hubble and helping build the International Space Station. Its solid rocket boosters were the first designed for reuse and the largest solid motors flown until 2022, and a seal failure in one of them caused the 1986 Challenger accident.
• DD-361 Blue/Green: When aluminum is added to copper sulfate solution with hydrochloric acid, the acid strips aluminum's oxide layer and aluminum displaces copper in a vigorous, heat-releasing reaction. Copper compounds give flames a characteristic blue-green color, because heat excites copper's electrons, which emit specific wavelengths as they relax. The footage shows the reaction and a green flame.
• DD-362 Eggs, Anyone?: Mosquitoes lay eggs in or near standing or slow-moving water, where larvae develop. Some genera, such as Culex, lay eggs in floating clusters called rafts, while others, like Aedes, lay eggs singly on damp surfaces where they can survive drying until flooded. Eggs often hatch within a few days. The footage shows a mosquito laying eggs on water.
• DD-363 Towering Tower: East Pacific Center Tower A in Shenzhen, completed in 2013, is about 306 meters (1,004 feet) tall and contains apartments within a mixed-use complex. The Reel calls it China's tallest residential building; I attributed that ranking to the Reel. The tower is in Futian District. The footage shows the tower and the city skyline.
• DD-364 Firefighting Drones: Firefighting drones are uncrewed aircraft that give crews aerial views, use infrared and thermal cameras to find hotspots and map fire spread, and in some designs spray water, foam or retardant through tethered hoses or onboard tanks. They are useful for high-rise buildings and rugged terrain. The footage shows a drone spraying water at a burning building.
• DD-365 Red Hot Calipers: Braking converts a car's kinetic energy into heat through friction between pads and rotors. In racing, repeated hard stops can heat rotors to well over 1,000 degrees Fahrenheit (about 540 degrees Celsius), hot enough to glow red or orange; much of the visible glow comes from the rotors, with heat soaking into the calipers. The footage, credited to NASCAR, shows glowing brakes on race cars.
• DD-366 Helicopter Chainsaws: Aerial saws are rigs of about ten circular saw blades on a long vertical boom hanging below a helicopter. Pilots fly them along power line corridors and roads to trim branches, especially in remote or rugged terrain where ground crews struggle. The Reel calls them chainsaws, but the blades are circular saws. The footage shows a helicopter trimming a tree line.
• DD-367 Garbage Water: Trash traps such as floating booms, trash racks and mesh screens are installed in rivers, canals, storm drains and outfalls to catch plastics and debris before they reach larger bodies of water. Racks block large items and finer screens catch smaller particles; the collected waste is removed by crews. The footage shows a floating boom collecting trash in an urban canal.
• DD-368 Cotton Conveyors: Cotton module trucks carry large compressed modules of seed cotton from fields to gins. Their beds have built-in chain conveyors and tilt, so they can pick up a module from the ground and slide it off at the gin, cutting manual labor and limiting contamination of the fiber. The footage shows trucks loading and unloading cotton modules.
• DD-369 Urban Flood Control: Urban flooding happens when heavy rain overwhelms a city's drainage. Impermeable surfaces such as concrete, asphalt and rooftops keep water from soaking into the soil, so runoff rushes into storm drains faster than they can carry it. Cities respond with larger drains, retention basins, permeable pavement and green spaces. The footage shows floodwater surging through city streets.
• DD-370 Maeklong Market: The Maeklong Railway Market in Samut Songkhram Province, Thailand, sits on the tracks of the Maeklong Railway. When a train approaches, vendors fold their awnings and pull goods back from the rails; once it passes, they reopen within moments. The market sells fresh produce, seafood and local food and is a popular tourist stop. The footage shows a train passing through the market.
• DD-371 Gassy Accidents: Trucks carry natural gas either compressed (CNG) in high-pressure cylinders or liquefied (LNG) in insulated tanks at about minus 162 degrees Celsius. Tanks are built to withstand pressure and impacts, but collisions, equipment failures and leaks can release flammable gas that may ignite into fires or explosions. Regulations, maintenance and driver training reduce the risk. The footage shows a gas tanker fire and explosion.
• DD-372 Water in the Desert: Desert sand is loose and porous, with large gaps between grains, so water infiltrates quickly. It sinks until it reaches less permeable layers such as clay or bedrock; some can recharge aquifers, though much evaporates in desert heat. The footage shows water rushing across sand and soaking in at the front.
• DD-373 A Little Crowded: In Bangladesh, demand for rail travel peaks around holidays such as Eid, when many people return to their home districts. Trains become so crowded that passengers ride on roofs and cling to the outside, which is dangerous and officially discouraged. Bangladesh Railway has expanded services and enforcement to reduce it. The footage shows a train with passengers packed on its roof.
• DD-374 Delta IV Heavy: The Delta IV Heavy, built by United Launch Alliance, used three Common Booster Cores burning liquid hydrogen and oxygen. It could lift about 28,800 kilograms to low Earth orbit or about 14,200 kilograms to geostationary transfer orbit, and launched spy satellites, the Orion test flight and the Parker Solar Probe. It first flew in 2004 and made its final flight on April 9, 2024. The footage shows a Delta IV Heavy launch.
• DD-375 Wakey Wakey: A dormant volcano has not erupted in a long time but could again. It can reawaken when new magma rises into its plumbing, when gases build pressure in the chamber, or when tectonic movement opens fractures. Scientists watch for earthquakes, ground swelling and gas changes. Mount Pinatubo, quiet for about 500 years, erupted in 1991. The footage shows an erupting volcano.
• DD-376 Quarrels With Quarrying?: Decorative stones such as marble and onyx are quarried with diamond wire saws and other precision cutters to free large, undamaged blocks. Shale, used for cement and bricks, is broken out with heavy machinery or blasting and crushed. The method depends on whether the stone's appearance matters. The footage shows wire saws and machines working a quarry.
• DD-377 Leafy Sheep: Costasiella kuroshimae, nicknamed the leaf sheep, is a sea slug about 5 millimeters long found in shallow waters around Japan, Indonesia and the Philippines. Its back is covered in green, leaf-like cerata. It eats algae and keeps their chloroplasts in its tissues, a process called kleptoplasty; how much energy it gains from them is still studied. The footage shows macro views of the slug.
• DD-378 Imposter Crab: Imitation crab is made from surimi: white fish, often Alaska pollock, is minced and washed to remove fat and impurities, leaving a protein paste. The paste is mixed with starch, egg white and flavorings, heated and shaped into sticks or flakes, colored red on one side, then packaged and frozen. The footage shows surimi sticks being made on a factory line.
• DD-379 Sanctuary of Truth: The Sanctuary of Truth in Pattaya, Thailand, is a carved wooden structure about 105 meters tall, built with wooden joinery rather than metal nails. Thai businessman Lek Viriyaphant began it in 1981, and carving and restoration continue; the Reel puts completion around 2050. Its design mixes Thai, Khmer, Chinese and Indian styles with Hindu and Buddhist imagery. The footage shows the sanctuary and its carvings.
• DD-380 433 Eros: 433 Eros is a near-Earth asteroid about 34 by 11 by 11 kilometers, discovered in 1898. NASA's NEAR Shoemaker spacecraft orbited it in 2000 and landed on it on February 12, 2001, the first landing on an asteroid. Manhattan is about 21.6 kilometers (13.4 miles) long, so Eros would overhang it. The footage shows an animated Eros hovering over a landscape for scale.
• DD-381 The Dulla: The dulla is a male dromedary camel's soft palate, which he inflates and pushes out of the side of his mouth as a pink, balloon-like sac during the rutting season. It comes with gurgling sounds and is used to attract females and warn rival males. The footage shows camels displaying their dullas.
• DD-382 nICE: Commercial ice plants freeze large blocks in molds, lift them out with cranes or conveyors, and cut them with industrial bandsaws or cutting machines into smaller blocks, cubes or crushed ice. Some blocks are shaped or carved to order. The ice is rinsed, packaged and kept in cold storage. The footage, credited to kuramoto_ice_global, shows blocks of ice being sawed.
• DD-383 Button Bashing: Buttons are made from plastic, metal, wood, shell or fabric. Plastic buttons are usually injection molded or cut from cast sheets, and metal buttons are stamped from sheet metal. Holes are drilled or molded, and the buttons are finished by polishing, painting or plating. The footage shows a factory punching and finishing buttons.
• DD-384 The Nozzle Knows: Soft gelato and soft-serve machines freeze and aerate the mix, then dispense it through a nozzle that sets the portion and shape. Nozzles are usually stainless steel for hygiene and can have decorative tips for swirls. The Reel describes the nozzle as part of the move from manual scooping to machines; I attributed that history to the Reel. The footage shows gelato being dispensed in shaped swirls.
• DD-385 Lunar Topography: The Moon's craters were made by impacts of asteroids, comets and meteoroids over billions of years. Many large basins date to an early period of heavy bombardment, sometimes called the Late Heavy Bombardment, often placed about 4.1 to 3.8 billion years ago. The South Pole-Aitken Basin, about 2,500 kilometers across, is the largest. Without air or water, there is little erosion to wear them away. The footage shows close-up views of the lunar surface.
• DD-386 Ultrasonification: Ultrasonic cleaners send high-frequency sound through water or a cleaning solution, creating microscopic bubbles that form and collapse, a process called cavitation. The collapses produce tiny jets and shock waves that loosen dirt and oils from rings and settings. Some gems, such as emeralds, opals and pearls, can be damaged and should not be cleaned this way. The footage shows jewelry in an ultrasonic tank.
• DD-387 SonoShine: Sonoluminescence is the emission of brief flashes of light from bubbles in a liquid driven by intense sound. The sound's pressure swings make bubbles grow and then collapse violently, compressing the gas inside to temperatures of thousands of degrees. The exact light-emitting mechanism is still debated. The footage shows a glowing bubble in a lab flask.
• DD-388 Clouds From the Ground: Cloud seeding adds particles such as silver iodide or salt to clouds so water vapor condenses or freezes on them, potentially increasing rain or snow. Ground-based generators burn a silver iodide solution and rely on winds to carry the particles into suitable clouds; aircraft are used too. How much precipitation it adds is debated. The footage shows a large vapor plume billowing from a ground test stand; it does not appear to show cloud seeding itself.
• DD-389 A Look Inside: Decapping removes the plastic or ceramic package from an integrated circuit such as a RAM chip to expose the silicon die. It is usually done with hot acids such as fuming nitric or sulfuric acid, or by milling or laser ablation. The exposed die can then be inspected under optical or electron microscopes for failure analysis, quality checks or reverse engineering. The footage shows a memory chip being opened and its die magnified.
• DD-390 MUD: Mudflows are fast-moving mixtures of water, mud and debris that pour downhill when loose soil becomes saturated, often after heavy rain, during volcanic eruptions (lahars), or when dams or embankments fail. They can bury roads, buildings and vegetation under thick deposits. The footage shows a mudflow surging down a valley.
• DD-391 Fire & Ice: When lava, at temperatures that can exceed 1,100 to 1,200 degrees Celsius, flows onto snow, the snow melts and flashes to steam. The lava's crust and the steam layer slow heat transfer, so the flow can advance over snow surprisingly slowly, and trapped steam can burst in small explosions. Meltwater can also cause floods or lahars. The footage, credited to ABC7 Los Angeles, shows lava advancing over snow.
• DD-392 A Little Off the Top: Oil skimmers remove oil floating on water. Many use a belt, disc, drum or tube made of material that oil clings to more than water; as it moves through the surface the oil sticks, and a wiper scrapes it off into a container. Portable units handle small spills and industrial tanks. The footage shows a skimmer pulling oil from water.
• DD-393 striking!: A 2020 study estimated that about 17 meteorites, totaling some 6,100 a year, reach Earth's surface daily, most in oceans or remote areas. Over about 4.5 billion years, impacts number in the billions. Famous craters include Chicxulub in Mexico, linked to the extinction of the non-avian dinosaurs about 66 million years ago, and Meteor Crater (Barringer Crater) in Arizona, about 50,000 years old. The footage shows an animated Earth with impact points.
• DD-394 Acoustic Levitation: In acoustic levitation, ultrasonic transducers send sound toward a reflector or an opposing transducer, creating a standing wave with alternating high- and low-pressure regions. Small objects such as water droplets settle at the pressure nodes, where acoustic radiation pressure balances gravity. The footage shows droplets floating in a levitator.
• DD-395 Blood Destruction: Malaria still causes hundreds of thousands of deaths a year, about 95% of them in the WHO African Region. Ronald Ross's proof of the mosquito cycle won the 1902 Nobel Prize, inherited traits like sickle cell show how the disease has shaped human genes, and two vaccines are now in use.
• DD-396 We Are Condensed Energy: Albert Einstein's 1905 equation E = mc² states that mass and energy are equivalent, linked by the square of the speed of light. Ordinary matter is made of protons, neutrons and electrons, and most of the mass of protons and neutrons comes not from their quarks' own masses but from the energy of the strong force binding quarks and gluons. The footage shows abstract animations of particles and light.
• DD-397 Spores Galore!: Mushrooms are the reproductive bodies of fungi. They release microscopic spores from gills, pores or spines under the cap; many species actively launch spores a tiny distance, after which air currents carry them, sometimes very far. A single mushroom can release millions to billions of spores, raising the odds that a few land somewhere suitable. The footage shows time-lapse and close-up views of spores drifting from mushrooms.
• DD-398 ICECORE: Ice cores are long cylinders drilled from glaciers and ice sheets, some from depths of more than 3,000 meters. Snow builds up in yearly layers, and air bubbles trapped in the ice preserve samples of the past atmosphere, including greenhouse gases. Antarctic cores extend back about 800,000 years and record past climate and volcanic eruptions. The footage shows a view down a borehole in the ice.
• DD-399 I'd Pick You: To study what lava is made of, volcanologists collect samples from active flows with long-handled metal picks, hammers or scoops, often quenching the sample in water to preserve it. Basaltic lava commonly reaches about 1,100 to 1,200 degrees Celsius (2,000 to 2,200 degrees Fahrenheit), so they wear heat-resistant gear and work fast. The footage shows a scientist pulling molten lava from a flow with a pick.
• DD-400 The Titanpointe: The AT&T Long Lines Building at 33 Thomas Street in Manhattan is a 550-foot (168 m) windowless brutalist tower completed in 1974, designed by John Carl Warnecke & Associates to house long-distance telephone switching equipment and to withstand disasters, including nuclear fallout. In 2016, The Intercept reported that documents linked it to a National Security Agency surveillance site code-named Titanpointe; AT&T and the NSA did not confirm. The footage shows the building from street level.
• DD-401 Gassy Accidents II: On the evening of January 1, 2024, gas leaked during the filling of a bulk truck at an LPG charging station in Pyeongchang County, Gangwon Province, South Korea, and exploded. Five people were injured, two with severe burns, 14 buildings and several vehicles were damaged, and the fire took about three hours to put out; nearby residents were evacuated. The Reel gives the date as January 24. The footage shows the explosion and fire.
• DD-402 Old-Timey Laundry: Before electric washers spread in the 20th century, many households used hand-cranked or lever-operated machines with wooden tubs and internal paddles or dollies that agitated clothes. They still took real effort but were easier than scrubbing on a washboard. Electric washing machines appeared in the early 1900s. The footage shows an antique wooden washer being cranked.
• DD-403 Spreading Seeds: In January 2022, Brazilian skydiver Luigi Cani jumped over a deforested area near Novo Aripuanã in Brazil's Amazonas state and released about 100 million seeds of 27 native tree species from a biodegradable box. The box was dropped from a plane, and Cani reached it in free fall and opened it at about 6,500 feet so the seeds would spread evenly. The project aimed to help regrow the forest. The footage shows the jump and the seed release.
• DD-404 Hazardous Working Conditions: Falls from height are among the leading causes of death in construction worldwide. The Reel describes skyscraper sites where weak regulation, limited training and missing harnesses, fall-arrest systems and safe scaffolding put workers at risk, along with unguarded machinery and unsafe material handling. The footage shows a first-person view from high on a building under construction, with no visible fall protection.
• DD-405 Tesla's Coil: A Tesla coil is a resonant transformer invented by Nikola Tesla around 1891. A capacitor discharges through a primary coil of a few turns, and the oscillating magnetic field induces current in a secondary coil of many turns; resonance between the circuits builds very high voltage at high frequency. At the top terminal the voltage ionizes air and throws sparks. The footage shows a Tesla coil discharging.
• DD-406 Enter Sion: Sion Airport (LSGS) lies in the Rhône Valley in Switzerland's canton of Valais, surrounded by high Alpine terrain. According to the Reel, its instrument approach to Runway 25 uses an instrument guidance system with an initial 6-degree glide slope that eases to 4 degrees, much steeper than the standard 3 degrees, and pilots need special authorization to fly instrument approaches there. The footage shows an approach into the valley.
• DD-407 Acid Rust Removal: Rust is iron oxide. Acids, from mild citric or phosphoric acid to strong hydrochloric (muriatic) acid, react with it and dissolve it, leaving bare metal; in industry this is called pickling. Because bare steel rusts quickly and leftover acid keeps attacking it, the part is neutralized with a base such as baking soda, rinsed and dried or coated. The footage shows rusty parts cleaned in acid.
• DD-408 AI Surgery: Robot-assisted surgery systems such as the da Vinci Surgical System let a surgeon at a console control robotic arms that hold instruments and a 3D camera, scaling down hand movements for fine work through small incisions. Software and AI are being added for imaging, guidance and analysis, but in clinical use the surgeon directs the procedure. The footage shows robotic arms performing delicate tasks.
• DD-409 Snowplower: Railroads use several types of snow-clearing equipment. Wedge plows push snow to either side, rotary plows use a spinning bladed wheel to cut deep drifts and hurl snow away, and flangers clear snow and ice from the flangeways beside and between the rails. They keep lines open in heavy-snow regions. The footage shows a rotary plow throwing a plume of snow.
• DD-410 Baffling: Baffle blocks are concrete blocks set in spillways, canals, chutes and stilling basins to break up fast flows. They create turbulence that dissipates the water's energy and slows it, reducing erosion and damage downstream. Their size and spacing are designed for the expected flow. The footage shows water churning over rows of baffle blocks.
• DD-411 Tanking Railways: Armies often move tanks over long distances by rail, loading them onto heavy-duty flatcars and securing them with chains, straps and wheel or track chocks. Rail moves many vehicles at once, saves wear on the tanks and roads and costs less than moving each one separately; it is used for deployments, exercises and transfers between bases. The footage shows tanks on rail flatcars.
• DD-412 Fall Marya: RDS-3, the Soviet Union's third nuclear test, took place on October 18, 1951, at the Semipalatinsk Test Site in present-day Kazakhstan. It was the first Soviet atomic bomb dropped from an aircraft, a Tupolev Tu-4 bomber, and it detonated about 400 meters above the ground with a yield of about 42 kilotons. The footage shows archival test film.
• DD-413 Pump Cavitation: Cavitation happens when local pressure in a pump falls below the liquid's vapor pressure, so vapor bubbles form. As the bubbles move into higher-pressure zones they collapse violently, sending out shock waves that cause noise, vibration, lost efficiency and pitting of gears, impellers and housings. The footage shows bubbles forming inside a transparent pump.
• DD-414 Heavy Flavor, Heavy Flow: Pyroclastic flows are fast-moving currents of hot gas, ash and rock fragments that rush down a volcano's slopes during explosive eruptions. They typically move at about 100 kilometers per hour and can exceed 700 kilometers per hour, with temperatures that can top 1,000 degrees Celsius, making them among the deadliest volcanic hazards; one destroyed Saint-Pierre on Martinique in 1902. The footage shows glowing lava flows rather than a pyroclastic flow.
• DD-415 Raccoon Wash: Raccoons (Procyon lotor) often dabble or dunk food in water. Researchers think this is not cleaning: their front paws are packed with sensitive nerve endings, and wetting them may heighten touch, helping them identify food. Raccoons also do the motion without water. The footage shows a raccoon rubbing food in water.
• DD-416 The Chase: Police vehicle pursuits in the United States can end in fatal crashes. The Reel cites at least 3,336 deaths from 2017 to 2022, nearly two a day, and says about 27% were bystanders; many pursuits begin over traffic violations or other nonviolent offenses, and policies on when to pursue vary by department. I attributed the figures to the Reel. The footage shows a police chase.
• DD-417 Self-Parking Chairs: In February 2016, Nissan showed the Intelligent Parking Chair, an office chair that rolls itself back to its place at a table when someone claps. Based on its cars' parking-assist technology, the system used four cameras on the walls to track each chair from above and steer motorized wheels. It was a promotional demonstration rather than a product. The footage shows the chairs returning to a conference table.
• DD-418 Insect Murder Mesh: A bug zapper uses a transformer to charge an inner wire grid to a high voltage. Ultraviolet light or bait attracts insects; when one bridges the gap between grid wires, current flows through it and kills it. An outer protective mesh keeps hands and larger objects away from the live grid. The footage shows insects being zapped.
• DD-419 Advanced Bicycle Riding II: Snow biking covers riding bicycles on snow, mostly on fat bikes with tires about 4 to 5 inches wide run at low pressure for grip and flotation. Ski bikes or skibobs replace one or both wheels with skis and are ridden on slopes. Riders use groomed trails, backcountry routes and ski areas. The footage shows riders racing down a snowy slope.
• DD-420 Rabies Crazies: Rabies is a viral infection usually spread by bites or scratches from infected animals. The virus travels along peripheral nerves to the brain, where it causes encephalitis. Animals may show furious rabies, with aggression, drooling and lack of fear, or paralytic rabies, with weakness and paralysis. Once symptoms appear it is nearly always fatal, though vaccination soon after exposure prevents it. The footage shows animals with behavior changes.
• DD-421 Turbine Troubles: Before certification, jet engines go through destructive tests. In a fan blade-out test, a blade is released at full power with a small explosive charge, and the casing must contain the fragments and the engine must shut down safely. Other tests fire birds, ice and water into running engines. The footage shows engine tests on a test stand.
• DD-422 Jellyfish Delicious: Sea turtles, especially leatherbacks (Dermochelys coriacea), eat jellyfish. Leatherbacks have sharp, scissor-like jaws, and their mouths and throats are lined with backward-pointing spines called papillae that grip slippery prey and let them expel water without losing the meal. The footage shows a sea turtle eating a jellyfish.
• DD-423 Rolling Steel: Plate rolling bends flat steel into curves and cylinders. In a common three-roll machine, two lower rollers support the plate while an upper roller presses down, and the plate is run back and forth as the pressure increases step by step. Adjusting roller position and pressure sets the curve for plates of different thicknesses. The footage shows a thick plate being rolled.
• DD-424 Hose Goals: Firefighters can use a wide fog pattern from a hose as a protective water curtain. Fine droplets absorb heat, especially as they turn to steam, cool nearby surfaces and block radiant heat, and the steam can dilute oxygen near the flames. Crews use it to advance on or retreat from fires. The footage shows firefighters advancing behind a water spray.
• DD-425 Air Burst Sorting: Optical sorters feed items along a belt or chute past cameras or sensors that judge color, shape or material. When an item matches the rejection rule, a precisely timed burst from an air jet knocks it into a separate stream. The method is used in recycling, food processing and mining. The footage shows mixed recyclables being sorted by air jets.
• DD-426 From the Depths: The viper dogfish (Trigonognathus kabeyai) is a small, rarely seen deep-sea shark of the Pacific, recorded off Japan and Hawaii. It has long, fang-like teeth and jaws that can shoot far forward to grab fish and crustaceans. It migrates toward shallower water at night to feed. The footage shows a viper dogfish thrusting its jaws.
• DD-427 Bone Eater: The bearded vulture (Gypaetus barbatus) lives in mountains of Europe, Africa and Asia and feeds mainly on bones, which can make up 70 to 90 percent of its diet. Its very acidic stomach digests large bone pieces, and it drops bones too big to swallow from height onto rocks to break them. The footage shows a bearded vulture carrying and dropping a bone.
• DD-428 Desert Express: Railways across deserts such as the Sahara, the Arabian Peninsula and the Australian outback carry freight and ore across arid regions but face blowing, abrasive sand. Lines may be built on raised ballast beds so sand blows across, sand fences and barriers are placed along exposed stretches, and crews clear drifts from the track. The footage shows the view from the front of a train as it runs over sand-covered rails.
• DD-429 Seems Familiar: Researchers place mice and rats in virtual reality setups, typically with the animal on a treadmill or floating ball surrounded by screens that update as it walks. Because the animal stays in place, scientists can record neurons during navigation, learning and decision-making. Newer systems use tiny headsets. The footage shows a mouse in a VR rig.
• DD-430 Shanghai: Shanghai, on China's east coast where the Yangtze River meets the East China Sea, has about 24 million residents and is a major center of finance and trade. It grew as an international port after 1842. The Bund waterfront is lined with early 20th-century buildings, while Pudong across the Huangpu River holds modern skyscrapers. The footage shows the Shanghai skyline.
• DD-431 Varnish Vanishing: Varnish protects paintings and saturates their colors, but natural resin varnishes yellow and darken with age. Conservators test solvents on small, hidden areas, then roll swabs to dissolve and lift the old varnish in small sections without disturbing the paint, often revealing much brighter colors. A new, stable varnish may be applied afterward. The footage shows a conservator swabbing varnish off a painting.
• DD-432 Naturally Selected: Storks often lay several eggs that hatch days apart, so chicks differ in size. When food is scarce, parents may kill or eject the weakest chick, focusing care on those most likely to survive; biologists call this brood reduction. White storks (Ciconia ciconia) have been filmed throwing chicks from nests. The footage shows a stork pushing a chick out of a nest.
• DD-433 Leech Gourmet II: Not all leeches are small blood-sippers. Some large leeches prey on amphibians such as frogs in rainforests and freshwater, latching on with their muscular, suckered bodies and feeding on blood or soft tissue; some species use a proboscis to pierce prey, while others have jaws. The footage shows a large leech attacking a frog.
• DD-434 Garbage Water II: Autonomous river-cleaning robots are small boats that navigate waterways on their own, using sensors, cameras and software to spot floating plastic and debris, scoop it into onboard bins and steer around obstacles and wildlife. Several cities and companies have tested them on rivers, canals and harbors. The footage shows a robotic boat collecting floating trash.
• DD-435 Cerastes Cerastes: The Saharan horned viper (Cerastes cerastes) is a venomous snake of the deserts of North Africa and parts of the Middle East. Many individuals have a horn-like scale above each eye, though some lack them. Its sandy coloring camouflages it, it often buries itself in sand to ambush prey, and it moves by sidewinding, leaving distinctive tracks. The footage shows a horned viper in sand.
• DD-436 Angel of Death: The Lockheed AC-130 is a heavily armed ground-attack variant of the C-130 Hercules transport, first used by the U.S. Air Force during the Vietnam War in the late 1960s. Like many military aircraft, it carries flares, pyrotechnic decoys that burn hot to draw infrared-guided missiles away. Released in symmetric patterns, the flare trails can resemble wings, a display sometimes called angel flares. The footage shows an AC-130 releasing flares.
• DD-437 Drone Swarms: A drone swarm is a group of drones that coordinate through algorithms and wireless links, sharing data in real time to keep formation, divide tasks or adapt to changes. Swarms are used for light shows, mapping and search and rescue, and are also developed for military use. The footage shows a dense swarm of drones flying in formation.
• DD-438 Articulated Prosthesis: Articulated prosthetic hands have multiple jointed fingers to mimic a natural hand. Many are myoelectric: electrodes on the skin pick up electrical signals from muscles in the residual limb, and motors turn them into grips, pinches or pointing. The footage shows a prosthetic hand moving its fingers.
• DD-439 PandaPandaPanda: Giant pandas are classified as carnivorans and keep a carnivore's gut and genes, yet about 99% of their diet is bamboo, from which they get little energy or protein. A modified wrist bone helps them grip stems, and their wild numbers have recovered enough for the IUCN to list them as Vulnerable rather than Endangered since 2016.
• DD-440 Print Your Home: Construction 3D printing uses large gantry or robotic-arm printers to extrude concrete or similar mixes layer by layer, building walls directly from a digital design. Printing the walls of a small house can take roughly 24 to 48 hours of print time, though roofs, windows, plumbing and finishing add more time. Supporters cite less labor and waste. The footage shows a printer laying concrete walls.
• DD-441 OverGrowth UnderPass: Cities cover concrete walls, pillars and underpasses with climbing plants, vertical gardens and green walls. Plants such as ivy and creeping fig tolerate shade and urban conditions, and the greenery can cool surfaces, trap dust and make infrastructure more pleasant. Some cities, such as Mexico City and Chengdu, have planted overpass pillars on a large scale. The footage shows overpasses covered in plants.
• DD-442 Painting Rubik: First sold as the Magic Cube in Budapest in 1977, the Rubik's Cube became the world's best-selling toy, with about 500 million sold by January 2024. Its 43 quintillion possible positions can all be solved in 20 moves or fewer, a limit proved in 2010 with computing time from Google.
• DD-443 Blood Beach: Hormuz Island in Iran's part of the Persian Gulf is known for red soil and sand rich in iron oxide, mainly hematite, which washes onto its beaches and colors the surf red. Locals use the red earth, called gelak, in cooking and crafts. The footage shows the island's red soil and sand.
• DD-444 FREEZING: When water cools below 0 °C (32 °F), its molecules lock into a hexagonal crystal lattice held by hydrogen bonds, each molecule bonded to four neighbors. The lattice is more open than liquid water, so ice is about 9 percent less dense and floats, and water expands as it freezes. The footage shows an animation of water molecules forming ice.
• DD-445 Gummi: When potassium chlorate is melted, it decomposes and releases oxygen. Dropping in a gummy bear, mostly sugar, sets off a violent, highly exothermic combustion with bright violet-tinged flames, heat and smoke. It is a classic chemistry demonstration done only with protective equipment. The footage shows a gummy bear burning in a test tube.
• DD-446 Full-Flow: Full-flow staged combustion is a rocket engine cycle in which all of the fuel and all of the oxidizer pass through separate preburners that drive the turbopumps, then enter the main combustion chamber as hot gases. Splitting the flow lets the turbines run cooler and supports high chamber pressures. SpaceX's Raptor was the first such engine to fly. The footage shows engine test firings.
• DD-447 Laser Rust Removal: Laser rust removal uses short, intense laser pulses to heat and ablate rust, paint and grime, which absorb the light more than the bare metal beneath. It is non-contact, precise and avoids solvents and abrasive blasting, and is used in restoration, aerospace and manufacturing. The footage, credited to vilalaserofficial, shows a laser cleaning rusty steel.
• DD-448 Root of the Problem: Root canal treatment addresses infection or damage in a tooth's pulp, the soft tissue with nerves and blood vessels. A dentist removes the pulp, cleans, shapes and disinfects the canals, then fills and seals them, usually with a rubbery material called gutta-percha, and often adds a crown. It can save teeth that would otherwise be extracted. The footage shows an animation of the procedure.
• DD-449 Network Earth: Submarine communications cables carry the vast majority of international data, the Reel says about 95 percent. Hair-thin optical fibers carry data as light, wrapped in layers of protection; near shore the cables add steel wire armor, while in the deep ocean they can be as thin as a garden hose. Repeaters boost the signal every several dozen kilometers. The footage shows cable being laid from a ship.
• DD-450 Rotary Wrecking: Chimney sweeps and relining crews remove old clay flue tiles and mortar with rotary tools lowered down the flue on rods or cables. A motor spins chains or carbide- or diamond-tipped heads that break or grind away the liner, clearing room for a new one. The footage shows a rotary tool breaking tiles inside a chimney.
• DD-451 Proton-M: Proton-M is a Russian heavy-lift rocket. On July 2, 2013, one carrying three GLONASS navigation satellites veered off course right after liftoff from Baikonur and crashed; investigators found angular velocity sensors had been installed upside down. On May 16, 2015, another Proton-M failed during ascent and lost Mexico's MexSat-1 satellite. The footage shows the 2013 crash.
• DD-452 Komodo: Komodo dragons (Varanus komodoensis), the largest living lizards, have loosely jointed, flexible jaws, expandable throats and stretchy stomachs, so they can swallow large chunks or small prey whole, using head-tossing motions to force food down. Serrated teeth tear off pieces when prey is too large. They can eat up to about 80 percent of their body weight in a meal. The footage shows Komodo dragons feeding.
• DD-453 Freeloader Fish: Juvenile trevally and some filefish shelter in or beneath jellyfish bells, using the stinging tentacles as a shield against predators and picking off food the jellyfish has caught or nibbling its tissue, the Reel says. It describes the relationship as commensalism, in which the fish benefit and the jellyfish is largely unaffected. The footage, credited to elevatedmoments.co, shows small fish swimming inside a jellyfish.
• DD-454 Seeing Things Differently: Laser vision correction aims to reduce dependence on glasses or contacts by reshaping the cornea. The main procedures are LASIK (laser-assisted in situ keratomileusis), PRK (photorefractive keratectomy) and SMILE (small incision lenticule extraction). They treat refractive errors such as myopia, hyperopia and astigmatism. The footage, credited to life_withmedical, shows an eye during laser surgery.
• DD-455 Alaska Airlines 261: On January 31, 2000, Alaska Airlines Flight 261, a McDonnell Douglas MD-83 flying from Puerto Vallarta, Mexico, toward San Francisco and Seattle, crashed into the Pacific Ocean near Anacapa Island, California, killing all 88 people on board. The NTSB found the horizontal stabilizer's jackscrew assembly failed because of insufficient lubrication and excessive wear. The footage, credited to planesanity, shows a reconstruction of the flight.
• DD-456 Siphonophoria: Siphonophores (order Siphonophorae) are colonial hydrozoans made of specialized zooids that handle tasks like feeding, movement and reproduction while working together as one organism. The Portuguese man o' war is a well-known example, and some species reach great lengths. They capture prey with stinging cells called nematocysts. The footage, credited to seaclips.io, shows a siphonophore on the seafloor.
• DD-457 Burning Rubber: Tire fires are hard to extinguish because tires are made of flammable rubber, synthetic polymers and steel, and piles trap heat. They can smolder for days, weeks or months, releasing carbon monoxide, sulfur oxides, volatile organic compounds and heavy metals that pollute air, soil and water. The footage, credited to James Melville, shows a large tire pile burning.
• DD-458 Just a Chill Dog: Siberian Huskies cope with cold thanks to a thick double coat: water- and snow-repelling guard hairs over a dense, insulating undercoat. Furred paws with tough pads resist freezing and grip ice, and a countercurrent heat exchange in the limbs warms blood returning from the extremities, according to the Reel. The footage, credited to hackingtheuniverse, shows a husky resting in snow.
• DD-459 Luminol Lux: Luminol is a chemical used by forensic investigators to find traces of blood. Mixed with an oxidizer such as hydrogen peroxide, it reacts in the presence of the iron in hemoglobin, which acts as a catalyst, and gives off a blue glow, an example of chemiluminescence. Other substances such as bleach and some metals can cause false positives. The footage shows luminol glowing in the dark.
• DD-460 A Puzzle for Ants: Ant colonies solve problems such as finding food, building nests and moving large objects without a leader. Each ant follows simple rules and responds to pheromone trails, touch and local cues, and the colony's behavior emerges from these interactions, an example of swarm intelligence. Researchers have shown ant groups maneuvering loads through mazes more effectively than individuals. The footage shows ants working together to move an object through a puzzle.
• DD-461 Video Trickery II: A camera records a series of still frames at a set frame rate. If a helicopter's blades rotate by exactly one blade spacing, or a whole turn, between frames, each frame catches them in the same position and they appear frozen, a stroboscopic effect also called the wagon-wheel effect. Rolling shutter is a different effect that bends fast-moving blades. The footage shows a flying helicopter with apparently still rotors.
• DD-462 Art Is an Explosion: In 2006, Sony advertised its Bravia high-definition TVs with Paint, a commercial under the slogan Color Like No Other. It was filmed in the Toryglen area of Glasgow, Scotland, where about 70,000 liters of paint were blasted across a disused tower block, according to the Reel. The footage shows the colored explosions from the ad.
• DD-463 Canadian Super Scooper: The Canadair CL-415, nicknamed the Super Scooper, is an amphibious firefighting aircraft built by Canadair and later Bombardier. It scoops about 6,137 liters (1,621 U.S. gallons) of water while skimming a lake and can mix it with foam concentrate before a drop. The program later passed to Viking Air, now De Havilland Canada. The footage, credited to dailysci3nce, shows the plane scooping and dropping water.
• DD-464 Black Hole Binary: A supermassive black hole binary forms after two galaxies merge and their central black holes sink toward the middle and orbit each other. They spiral closer through interactions with surrounding stars and gas and, finally, by emitting gravitational waves, before merging into one more massive black hole. The footage, credited to astropodis, shows a simulation of two black holes orbiting.
• DD-465 Face Creator: Facial development begins around the fourth week of pregnancy, when neural crest cells migrate into the head region. The face starts as five tissue swellings, the facial prominences, that grow toward each other and fuse. Between weeks six and eight the nose, mouth and eyes take shape, and the palate forms from two shelves that grow inward and join at the midline. The footage, credited to DamnThatsInteresting, shows an animation of the face forming.
• DD-466 Little Birch Dance: Beryozka (also spelled Berezka, Russian for little birch) is a Russian dance troupe of female dancers founded in 1948 by choreographer Nadezhda Nadezhdina. Its signature routines use tiny, rapid steps hidden beneath floor-length skirts so the dancers appear to glide, an effect inspired by birch trees. The footage, credited to Sarahh, shows dancers gliding in formation.
• DD-467 Immune to Cold: Siberian Huskies tolerate cold through a double coat of water-repelling guard hairs and an insulating undercoat, furred paws with tough pads, and a countercurrent heat exchange that warms blood returning from the limbs, according to the Reel. The footage shows huskies in deep snow.
• DD-468 How Water Freezes: As water cools below 0 °C (32 °F), hydrogen bonds lock each molecule to four neighbors in a hexagonal lattice. The open, spacious structure makes ice less dense than liquid water, so it floats, and causes water to expand as it freezes. The footage shows an animation of molecules linking into a honeycomb lattice.
• DD-469 The Backbone of Modern Electronics: Integrated circuits are built on silicon wafers. In photolithography, a wafer is coated with a light-sensitive photoresist and exposed to ultraviolet light through a mask, transferring the circuit pattern; etching then removes unwanted material. The process repeats layer by layer before chips are tested and packaged. The footage shows wafers and chip close-ups.
• DD-470 Layer by Layer: On frozen lakes, ice thickens in layers as cold spells come and go; temperature swings, wind and pressure crack and stack the sheets into ridges and shards. The Reel's captions describe ice sheets formed from layers of ice in cold temperatures, varying with the intensity of temperature fluctuations. The footage, credited to all.litvinova, shows layered, broken ice on a frozen lake.
• DD-471 In Remembrance: Auschwitz was the largest Nazi German concentration and extermination camp, near Oświęcim in German-occupied Poland. It comprised Auschwitz I, the main camp; Auschwitz II-Birkenau, the main extermination site; and Auschwitz III-Monowitz, a labor camp serving industrial plants. Opened in 1940, it was a central site of the Holocaust, where about 1.1 million people, mostly Jews, were killed. It was liberated on January 27, 1945, and this Reel was posted on the 80th anniversary, International Holocaust Remembrance Day. The footage, credited to auschwitzmemorial, shows the camp today.
• DD-472 Flamboyant Fish: The flamboyant cuttlefish (Metasepia pfefferi) is a small Indo-Pacific cephalopod, not a fish. Its hatchlings emerge from translucent eggs as tiny, fully formed miniatures of the adults and can show vibrant coloration soon after. Adults flash purple, yellow and red warning colors as they walk along the seafloor. The footage, credited to science, shows hatchlings leaving their eggs.
• DD-473 One World Trade Center: One World Trade Center in Lower Manhattan is the tallest building in the Western Hemisphere, reaching a symbolic 1,776 feet (541 meters) including its spire, a nod to 1776. It is the main building of the rebuilt World Trade Center complex after the original Twin Towers were destroyed on September 11, 2001. Its structure was completed in 2013 and it opened in November 2014. The footage, credited to EarthCam, shows the tower from the air.
• DD-474 Go for a Spin: SpinLaunch is a U.S. company developing a kinetic launch system: a vacuum-sealed centrifuge spins a payload on an arm to hypersonic speed and releases it upward, aiming to cut fuel use and cost. A small rocket stage would still be needed to reach orbit. It has run suborbital test flights from a smaller accelerator in New Mexico. The footage, credited to SpinLaunch, shows a test launch.
• DD-475 Praise the Sun!: The heliosphere is the vast bubble of solar wind, the stream of charged particles emitted by the Sun, that extends outward past the planets until it meets the interstellar medium at the heliopause. It deflects much of the galactic cosmic radiation that would otherwise reach the inner solar system. The footage, credited to thegalacticvoid, shows an animation of the heliosphere.
• DD-476 Flame Control: Controlled or prescribed burns are fires set deliberately and carefully managed by trained crews. They clear dead vegetation and underbrush, restore fire-adapted ecosystems and reduce the fuel that drives severe wildfires. The footage, credited to curioXities (partly legible), shows a thin line of fire creeping across a park lawn under trees.
• DD-477 Kestrel Stability: Kestrels are small falcons famous for hovering while hunting. According to the Reel, falcons get their flight stability from long, pointed wings that reduce drag for fast dives and precise maneuvers, a tail that acts like a rudder, stiff primary feathers for stability at speed and softer secondary feathers for lift. The footage, credited to lawrencechatton, shows a kestrel in flight.
• DD-478 Capsule Core: Most automatic fire sprinkler heads are held closed by a glass bulb filled with a heat-sensitive liquid, or by a fusible metal link. When the surrounding air reaches the rated temperature, typically around 57-74 °C (135-165 °F), the liquid expands and shatters the bulb, or the link melts, releasing water only from the heads that are hot. The footage, credited to xplainingtheworld, shows a red sprinkler bulb bursting and water spraying.
• DD-479 Bubble Blowing: A bubble ring is a vortex ring of rotating water with air trapped in its core. When two collide, their vortices interact: head-on rings may briefly merge before breaking into smaller bubbles, while angled collisions can twist, reconnect or pass through each other, the Reel says. Outcomes depend on speed, rotation and angle. The footage, credited to astronomy.views, shows divers' bubble rings meeting underwater.
• DD-480 Black Hawk: The Sikorsky UH-60 Black Hawk is a four-blade, twin-engine, medium-lift utility helicopter introduced by the U.S. Army in 1979 and used by many allied forces. Roles include troop transport, medical evacuation, air assault and logistics. This Reel was posted a week after a U.S. Army Black Hawk collided with an American Eagle airliner over the Potomac River near Washington, D.C., on January 29, 2025. The footage shows a Black Hawk in flight.
• DD-481 Executive Orders: An executive order is a directive from the U.S. president that manages operations of the federal government. It does not need congressional approval but must rest on the Constitution or existing law. Orders can be challenged in court, blocked by Congress through legislation, or revoked by later presidents. This Reel was posted in February 2025, during a period of numerous new executive orders. The footage, credited to C-SPAN, shows a president signing orders.
• DD-482 DEI: Diversity, equity and inclusion (DEI) refers to organizational policies and programs. As the Reel defines them, diversity concerns representation across groups such as race, age and background; equity concerns fair treatment and access to resources; and inclusion concerns a culture where people feel welcome and able to contribute. DEI programs have been the subject of political and legal debate in the United States, including in early 2025 when this Reel was posted. The footage, credited to Apple, shows people in an office.
• DD-483 H-1B Visas: The H-1B is a U.S. nonimmigrant visa for workers in specialty occupations such as technology, engineering, finance and healthcare. An employer sponsors the worker; the visa is usually granted for three years and can be extended to six. Applicants generally need at least a bachelor's degree or equivalent. The annual cap is 85,000: 65,000 regular and 20,000 for holders of U.S. master's or higher degrees. The program was the subject of public debate when this Reel was posted in February 2025.
• DD-484 Bismuth Bound: Bismuth is one of the most strongly diamagnetic elements: it creates a weak magnetic field opposing an applied one. Placed near a strong neodymium magnet, pieces of bismuth can make a small magnet float stably between them, a form of diamagnetic levitation. The footage, credited to dydt, shows a small magnet hovering between iridescent bismuth crystals.
• DD-485 Levels to This: Automated parking systems move cars with mechanical lifts, shuttles or robotic platforms and stack them on multiple levels. With no ramps or driving lanes, they fit more vehicles into a smaller footprint, which suits dense cities. The footage, credited to Sharing Travel, shows cars being lifted into a parking tower.
• DD-486 The Gulf: The Gulf of Mexico is an ocean basin bordered by the United States, Mexico and Cuba, covering about 615,000 square miles (1.6 million km2). It holds major oil and gas reserves and supports fisheries and diverse ecosystems. The Reel was posted in February 2025, shortly after a U.S. executive order directed federal use of the name Gulf of America; the name Gulf of Mexico remains in international use. The footage, credited to 30A, shows beaches and turquoise water.
• DD-487 MAiD: Medical assistance in dying (MAiD) is legal in several jurisdictions, including Canada, Belgium and the Netherlands, and some U.S. states, where it is usually limited to terminally ill adults. A physician or nurse practitioner administers or prescribes medication under strict legal criteria, such as a grievous and irremediable condition, intolerable suffering and informed consent. Laws and eligibility differ widely and remain debated.
• DD-488 On ICE: U.S. Immigration and Customs Enforcement (ICE) is a federal agency within the Department of Homeland Security, created in 2003 after the Immigration and Naturalization Service (INS) was dissolved. Its main divisions are Enforcement and Removal Operations, which handles immigration enforcement, and Homeland Security Investigations. The Reel was posted in February 2025, when ICE enforcement was prominent in U.S. news. The footage, credited to WGN News, shows ICE officers during an operation.
• DD-489 The Cities of Tomorrow: Smart cities use connected sensors (the Internet of Things), data analytics, artificial intelligence and automation to manage infrastructure, transportation, energy and public services. Examples include adaptive traffic signals, automated waste collection, energy-efficient buildings and transit that adjusts to demand. The footage, credited to Real Image Production, shows a futuristic city.
• DD-490 Why So Sirius?: Sirius, also called the Dog Star in the constellation Canis Major, is the brightest star in the night sky, about 8.6 light-years away. It is a binary: Sirius A, a hot main-sequence star, and Sirius B, a white dwarf that was once a more massive, more luminous star before shedding its outer layers and collapsing. The footage, credited to galaxies, shows a twinkling star through a telescope.
• DD-491 Frozen Gators: When temperatures drop, American alligators (Alligator mississippiensis) enter brumation, a reptile dormancy in which metabolism slows sharply. In freezing water they may keep their nostrils above the surface as ice forms, letting them breathe while the rest of the body stays submerged and almost motionless. The footage, credited to AmazingNature, shows an alligator lying in icy water.
• DD-492 Lens Crafter: Contact lenses are made by cast molding, spin casting or lathe cutting; the Reel also mentions 3D printing. Rigid gas permeable (RGP) and custom lenses are often lathed from a solid disc to precise curvatures. Soft lenses are then hydrated, and all lenses are polished, inspected, sterilized and packaged in saline. The footage, credited to DamnThatsInteresting, shows lenses being machined.
• DD-493 Air Condor: Andean and California condors have wingspans of up to about 3 meters (10 feet). They ride thermals, columns of warm air rising from sun-heated ground and slopes, and ridge lift along mountains, gliding long distances with little energy while searching for carrion. The footage, credited to webnectarphoto, shows a condor soaring over mountains.
• DD-494 Retarred Roads: Road resurfacing (re-tarring, as the title puts it) restores pavement by adding a new asphalt layer. Crews assess cracks and potholes, clean and repair the surface, spray a tack coat so the layers bond, then lay hot mix asphalt with a paving machine and compact it with rollers to the right density and smoothness. The footage, credited to techniquebuildings, shows a paver laying asphalt.
• DD-495 Disk Jets: Gas and even shredded stars spiraling toward a black hole form an accretion disk that heats through friction and glows. Magnetic fields threading the disk can launch relativistic jets, beams of particles accelerated to nearly the speed of light, perpendicular to the disk. The footage, credited to galaxies, shows an animation of an accretion disk and jets.
• DD-496 Project Orion: Project Orion was a U.S. study from 1958 to 1965, led at General Atomics, of nuclear pulse propulsion: small nuclear explosions behind a spacecraft would strike a large pusher plate whose shock absorbers smoothed the thrust. It promised performance far beyond chemical rockets, with trips to Mars in weeks, but ended after the 1963 Partial Test Ban Treaty barred nuclear explosions in the atmosphere and space. The footage, credited to spaceman.in, shows an animated Orion craft.
• DD-497 The Plunge: When young penguins first go to sea, they gather at the water's edge and hesitate, partly because predators such as leopard seals and orcas may be waiting. Once one jumps, others quickly follow, and safety in numbers lowers each bird's risk, the Reel says, citing emperor penguins as an example. The footage, credited to natgeomagarab, shows a crowd of penguins at the edge of the ice.
• DD-498 Sea Dragon: Sea Dragon was a 1962 concept for a huge two-stage rocket designed by Robert Truax at Aerojet. It would be built cheaply in a shipyard, towed to sea, ballasted upright and launched from the water, avoiding a launch pad. The first stage burned RP-1 and liquid oxygen, the second liquid hydrogen and oxygen, and it was meant to lift about 550 tonnes to low Earth orbit. It was never built. The footage, credited to newspaceenterprise, shows an animation of the launch.
• DD-499 Fire Ball: On Earth, hot gases rise and draw in fresh air, giving flames their familiar teardrop shape. In microgravity there is no buoyant convection, so oxygen reaches the flame only by diffusion and the flame spreads equally in all directions, forming a sphere that is often dimmer and bluer. The footage, credited to galaxies, shows combustion experiments in orbit.
• DD-500 The Space Perspective: Space Perspective, a Florida company, developed Spaceship Neptune, a pressurized capsule lifted by a hydrogen balloon to about 100,000 feet (30 km), where passengers would see Earth's curvature without rocket G-forces; a trip was planned to last about six hours, at $125,000 a seat. An uncrewed test flight reached that altitude in September 2024. When this Reel was posted, the company had furloughed most staff; it was evicted from its Titusville base in March 2025 and acquired by Spain's Eos X Space in July 2025. The footage, credited to TheSpacePerspective, shows the balloon launch.
• DD-501 Cycle Country: The Netherlands is known for cycling infrastructure, with about 35,000 kilometers (21,700 miles) of dedicated cycle paths. Dutch cities use separated bike lanes, protected intersections, cyclist traffic signals, bike-friendly roundabouts, dedicated bridges and large underground bike parking, which encourage everyday cycling and reduce congestion and emissions. The footage, credited to eurekahnb, shows a bicycle parking structure.
• DD-502 Shifty Periphery: Peripheral vision is especially good at detecting motion. The outer retina has a higher share of rod cells, which are very sensitive to light changes and movement, while the central fovea is packed with cones for detail and color. Motion in the wide visual field helps the brain detect movement, keep balance and judge speed, the Reel says. The footage, credited to howeverythingworks, shows a motion illusion.
• DD-503 Going Up?: A space elevator is a theoretical structure carrying cargo and people to space on a cable anchored at the equator and extending past geostationary orbit, about 35,786 km (22,236 miles) up, to a counterweight. Earth's rotation keeps the cable in tension, with the outward centrifugal effect balancing gravity. No known material is yet strong enough to build one. The footage, credited to tradzak, shows an animated ride up the cable.
• DD-504 Flame Whirls: Fire whirls, or fire tornadoes, form when intense heat drives rising air that begins to rotate, often helped by wind shear or terrain, creating a spinning column of flame and hot gas. They can reach over 1,000 °C (1,800 °F), move unpredictably and spread embers. The footage, credited to extremenature, shows a fire whirl over burning ground.
• DD-505 The Price of Eggs: Chick culling is the killing of male chicks in the egg industry. Males of laying breeds cannot lay eggs and are not efficient meat birds compared with broilers, so they are considered uneconomical. Common methods include gassing and maceration; regulations vary by country, and some countries have banned the practice or are adopting in-ovo sexing to identify males before hatching. The footage, credited to fuck.animal.cruelty, shows chicks on a hatchery line.
• DD-506 Huangluo Village: In Huangluo village, in Longsheng County in China's Guangxi region, women of the Red Yao, a branch of the Yao people, are known for very long hair, often more than 1.7 meters (5.5 feet), the Reel says. They traditionally wash it with fermented rice water, credited locally with keeping it strong, shiny and dark into old age, and long hair is linked with prosperity and longevity. The village draws many tourists. The footage, credited to guilinchina, shows Red Yao women with their long hair.
• DD-507 Old-Timey Laundry: Wringer washers, sold by retailers such as Montgomery Ward in the early to mid-20th century, combined a tub agitated by a hand crank or electric motor with a wringer: two rollers that pressed water out of clothes before they were hung to dry. They were common in homes before automatic washers with spin cycles took over. The footage, credited to technology, shows a vintage wringer washer.
• DD-508 Mk-II Aurora: The Mk-II Aurora is a small, remotely piloted, reusable suborbital spaceplane built by New Zealand-based Dawn Aerospace. It takes off and lands horizontally on ordinary runways and is designed to eventually exceed 100 km. Its first rocket-powered flights were on March 29-31, 2023, at Glentanner Aerodrome on New Zealand's South Island, reaching about 315 km/h (196 mph); in November 2024 it flew supersonic. The footage, credited to cora.a.harris, shows the spaceplane.
• DD-509 Civil War: Captain America: Civil War (2016) began Phase Three of the Marvel Cinematic Universe. The narrator calls it 'Avengers 2.5' and praises its ideological clash between Tony Stark and Steve Rogers over government oversight, the introductions of Black Panther and Spider-Man, and the airport battle, while noting that some fans found Zemo's plan convoluted. These are the narrator's opinions. The footage, credited to Multiverso dos Herois, shows scenes from the film.
• DD-510 The Sorcerer Supreme: Doctor Strange (2016) introduced the mystic arts to the Marvel Cinematic Universe, with Benedict Cumberbatch as Stephen Strange. The narrator praises its Inception-style city folding and mirror-dimension battles and its time-loop ending against Dormammu, but calls Kaecilius forgettable, notes comparisons between Strange's arc and Tony Stark's, and mentions debate over Tilda Swinton's casting as the Ancient One. These are the narrator's opinions. The footage, credited to ClipsyBox, shows scenes from the film.
• DD-511 Boosting My EGO: Written and directed by James Gunn, Guardians of the Galaxy Vol. 2 out-grossed its predecessor with about $863.8 million worldwide. It was the first film shot with an 8K camera and was filmed at Pinewood Atlanta Studios in Georgia.
• DD-512 Homecoming: Spider-Man: Homecoming (2017) brought Tom Holland's Peter Parker into his own MCU film, skipping a full origin story in favor of a coming-of-age approach. The on-screen commentary praises Michael Keaton's Vulture, Adrian Toomes, and his blue-collar motivation, and the reveal scene, while saying the film sometimes plays it safe. These are the narrator's opinions. The footage, credited to ONE Media, TopMovieClips and Movieclips, shows scenes from the film.
• DD-513 Ragnarok: Thor: Ragnarok (2017), directed by Taika Waititi, shifted the Thor films toward a colorful, comedic, cosmic tone. The narrator praises Chris Hemsworth's comic timing, Loki, Hulk and Korg, and how the film strips Thor of Mjolnir, Asgard and an eye; it calls Cate Blanchett's Hela striking but underused. These are the narrator's opinions. The footage, credited to AlphaClips, shows scenes from the film.
• DD-514 Wakanda Forever: Despite its title, the Reel reviews Black Panther (2018), not the 2022 sequel Black Panther: Wakanda Forever. The on-screen commentary praises its Afrofuturist vision of Wakanda, Chadwick Boseman's charisma and Michael B. Jordan's Killmonger, whose motives touch on family legacy and responsibility, while calling the CGI-heavy finale one of its weaker points. These are the narrator's opinions. The footage, credited to Lania, TNT, Marvel Fan Studios and Marvel Universe Entertainment, shows scenes from the film.
• DD-515 Perfectly Balanced: Avengers: Infinity War (2018) brought a decade of MCU films to a head against Thanos. The narrator calls Thanos the franchise's strongest antagonist, highlights Gamora's death on Vormir and Thor's arrival in Wakanda with Stormbreaker, and calls the ending, in which Thanos erases half of all life, one of superhero cinema's boldest moves. These are the narrator's opinions. The footage, credited to ZikTek, shows scenes from the film.
• DD-516 Ant-Man and the Wasp: Ant-Man and the Wasp (2018) followed Infinity War with smaller-scale stakes. The narrator praises Paul Rudd's Scott Lang, Evangeline Lilly's Hope van Dyne as the Wasp and the size-shifting fights, calls the villain Ghost underdeveloped, and notes that the Quantum Realm became crucial in Endgame and that the mid-credits scene ties the film to the snap. These are the narrator's opinions. The footage, credited to TNT, shows scenes from the film.
• DD-517 Captain Marvel: Captain Marvel (2019) was the first MCU film led by a female hero, with Brie Larson as Carol Danvers in a 1990s-set origin story featuring the shape-shifting Skrulls. The narrator praises its nostalgia and cosmic action, mentions critics who found Carol's arc lacking emotional depth, and notes that it set up her role in Endgame. These are the narrator's opinions. The footage, credited to PEKKA B-SPAN (partly legible), shows scenes from the film.
• DD-518 On Your Left: Avengers: Endgame (2019) concluded the Infinity Saga after 11 years of films. The narrator highlights the post-snap opening, the time heist through earlier films, and the final battle with Captain America wielding Mjolnir, the return of the dusted heroes and Iron Man's sacrifice; some found the time-travel logic confusing and 'Fat Thor' undercut his emotional arc. These are the narrator's opinions. The footage, credited to Film HD 60FPS, shows scenes from the film.
• DD-519 Far From Home: Spider-Man: Far From Home (2019) served as the epilogue to Endgame and the Infinity Saga, following Peter Parker on a European school trip as he struggles with Iron Man's legacy. The narrator praises Tom Holland and Jake Gyllenhaal's illusion-wielding Mysterio and the London finale, while saying the high school comedy is a bit overplayed. These are the narrator's opinions. The footage, credited to RememberThis Clips, shows scenes from the film.
• DD-520 Tesla: Tesla, named after the inventor Nikola Tesla, grew from a small carmaker into one of the world's most valuable companies. It built Gigafactories in China, Germany and Texas, made the Model 3 the world's best-selling electric car for four years, and expanded into solar through a disputed 2016 takeover of SolarCity.
• DD-521 DOGE: The Department of Government Efficiency (DOGE) was established by executive order on January 20, 2025, by renaming the U.S. Digital Service, with a stated goal of modernizing federal technology and cutting spending. Elon Musk was its most prominent figure. It is not a cabinet-level department. Around the time of this Reel, the administration announced federal workforce reductions, including plans to cut Department of Defense civilian staff, and floated returning savings to taxpayers. Its actions have been the subject of political debate and lawsuits. The footage, credited to United States Institute of Peace, shows a federal building.
• DD-522 SpaceX: SpaceX is a private aerospace company founded by Elon Musk in 2002 with the long-term aim of enabling Mars colonization. It developed the Falcon 9 and Falcon Heavy rockets, whose boosters land for reuse, and the Dragon capsule, the first commercial vehicle to carry astronauts to the International Space Station, in 2020. Its Starship is designed to be fully reusable for Moon and Mars missions. The footage, credited to Black Hole and SpaceX, shows launches, Dragon and Starship.
• DD-523 Cell Death: Apoptosis is programmed cell death, a tightly regulated process that removes damaged or unneeded cells. Unlike necrosis, which is uncontrolled and inflammatory, apoptosis is triggered by internal stress such as DNA damage or oxidative stress, or by external signals such as death ligands and immune cells, and proceeds through caspases, enzymes that dismantle the cell. The footage, credited to michaeloftiktokofficial, shows a cell breaking apart under a microscope.
• DD-524 Quenching: High-frequency induction hardening heats the surface layer of a steel or cast iron part with alternating current in a coil, then rapidly quenches it in water, oil or a polymer solution. The result is a hard, wear-resistant surface over a tougher, more ductile core. The footage, credited to metalaworld, shows a glowing part being heated and quenched.
• DD-525 Wet Response: Fingers and toes wrinkle after soaking because the autonomic nervous system constricts blood vessels under the skin, reducing volume and pulling the skin into folds; it does not happen if the finger's nerves are cut. Some studies suggest the pattern improves grip on wet objects. The footage, credited to photoowlsocial, shows a fingertip wrinkling in water.
• DD-526 Heat Sinks: Heat sinks draw heat away from electronics through many thin fins that increase surface area. Fins can be made by extruding aluminum profiles, CNC milling, or skiving, in which a sharp blade slices thin fins up from a solid block of copper or aluminum. The footage, credited to yh1234581, shows fins being sliced into a metal block.
• DD-527 Neuralink: Neuralink, co-founded by Elon Musk in 2016, develops implantable brain-computer interfaces (BCIs): a small chip with ultra-thin electrode threads that records and can stimulate brain activity. Its near-term aim is helping people with paralysis control devices; its stated long-term goal is human-AI symbiosis. The first human implant was in January 2024. The footage, credited to Neuralink, ABC News and Royalty Free Content, shows the implant and animations.
• DD-528 The Boring Company: The Boring Company, founded by Elon Musk in 2016, digs tunnels intended to reduce urban traffic. Its Vegas Loop carries passengers in Tesla vehicles through tunnels under the Las Vegas Convention Center. The company aims to cut tunneling costs with its own boring machines. The footage, credited to CBS Mornings and The Boring Company, shows cars in tunnels and a tunnel boring machine.
• DD-529 Starlink: Starlink is a satellite internet service from SpaceX that provides broadband to underserved and remote areas. It uses a large constellation of small satellites in low Earth orbit that communicate with user dishes and ground stations. Older satellite internet relied on geostationary satellites with high latency; Starlink's much lower orbits shorten transmission time. The footage, credited to Starlink, shows dishes and a Starship deploying satellites.
• DD-530 Machine Motors: Precision electric motors such as servo motors, stepper motors and brushless DC (BLDC) motors use microcontrollers, sensors and feedback loops to control speed, torque and position very accurately, down to fractions of a degree. They are essential in robotics, CNC machining, medical devices and aerospace. The footage, credited to action.box, shows motors moving with precision.
• DD-531 Stay Pressed: Sunflower oil is extracted from seeds by pressing, solvent extraction or both. In cold pressing, a screw (expeller) press squeezes the seeds while keeping temperatures low, the Reel says below 50 °C, to preserve flavor and nutrients, yielding a natural, unrefined oil. Hot pressing and refining give higher yields. The footage, credited to explainingtheuniverse, shows oil flowing from a screw press.
• DD-532 TAKEOFF: In ski jumping, athletes slide down an in-run, launch from the take-off and fly as far as possible before landing on a sloped hill. Scores combine distance points with judges' style points for flight form and landing. Since 2009, compensation points adjust for wind and for changes to the start gate to keep competition fair. The footage, credited to Red Bull, shows a ski jumper in flight.
• DD-533 Canadian Moose: Moose (Alces alces) live across Canada's boreal and mixed forests, wetlands and tundra edges. Large bulls can stand about 2.1 meters (7 feet) at the shoulder and weigh over 600 kg (1,300 pounds), and grow broad antlers spanning up to about 1.8 meters, used in rut displays and fights. Moose are strong swimmers and can dive several meters to feed on aquatic plants. The footage, credited to kuamzz, shows a bull moose in a forest.
• DD-534 Flying Fishermen II: Kingfishers are a worldwide family of brightly colored birds with sharp bills and keen eyesight. Many hunt by perching quietly over water, then diving headfirst to catch small fish or aquatic insects. A transparent third eyelid protects the eye underwater, and they can compensate for refraction to strike accurately, the Reel says. The footage, credited to harrycollinsphotography, shows a kingfisher diving.
• DD-535 Soros: George Soros is a Hungarian-American investor and philanthropist. He made his fortune in hedge funds, notably the Quantum Fund, and became famous on September 16, 1992 ('Black Wednesday'), when his short bet against the British pound earned about $1 billion as the U.K. left the European Exchange Rate Mechanism. Through his Open Society Foundations he has given more than $32 billion, the Reel says, to causes such as democracy, human rights and education. He is also a prominent, and often debated, political donor. The footage, credited to Bloomberg Originals, shows Soros.
• DD-536 Zuckerberg: Mark Zuckerberg co-founded Facebook in 2004 while a student at Harvard and remains CEO of its parent, renamed Meta Platforms in 2021. Under him the company acquired Instagram (2012), WhatsApp (2014) and Oculus (2014) and expanded into messaging and virtual reality. He has been central to debates over data privacy, misinformation, content moderation and social media's political impact. The footage, credited to TheProjectTV, shows Zuckerberg.
• DD-537 Fauci: Anthony Fauci directed the U.S. National Institute of Allergy and Infectious Diseases (NIAID) from 1984 until he stepped down in 2022, and served as chief medical adviser to the president from 2021 to 2022. He worked on responses to HIV/AIDS, SARS, Ebola and COVID-19, and became a prominent and politically debated public figure during the COVID-19 pandemic, including over public health communication and vaccination. The footage, credited to NBC News, Sky News and CBS Evening News, shows Fauci in interviews and briefings.
• DD-538 Trade Wars: Tariffs are taxes a government places on imported goods, used to raise revenue, protect domestic industries or gain leverage in trade disputes. They can support local producers but also raise prices for consumers and businesses and invite retaliatory tariffs from trading partners. The Reel was posted on April 8, 2025, days after the U.S. announced broad new tariffs on April 2, 2025, and amid retaliation and market turmoil. The footage shows the U.S. Capitol, container ships and markets.
• DD-539 HHS: The U.S. Department of Health and Human Services (HHS) protects Americans' health and provides human services. It traces to the Department of Health, Education, and Welfare, created in 1953 and renamed HHS in 1979. It oversees Medicare, Medicaid and Affordable Care Act programs and agencies including the CDC, FDA and NIH. The Reel was posted in April 2025, shortly after HHS announced a major restructuring and staff cuts. The footage, credited to New York Post, shows HHS leaders and offices.
• DD-540 Traffic Controls: Congestion pricing charges drivers a fee to enter or drive in busy urban areas, usually during peak hours, to cut traffic and emissions and encourage public transit. Systems typically use cameras that read license plates, with fees varying by time, location or vehicle type. New York City launched the first U.S. program in Manhattan on January 5, 2025, after long political and legal debate. The footage, credited to cinetrove, shows city traffic.
• DD-541 One Small Fall for Man...: During the Apollo Moon landings (1969-1972), astronauts sometimes fell over. Lunar gravity is about one-sixth of Earth's, and pressurized suits that protected them from extreme temperatures and micrometeoroids were bulky and stiff, making bending, turning and recovering balance difficult. Many adopted a bunny-hop gait to move efficiently. The footage, credited to galaxies, shows astronauts falling on the Moon.
• DD-542 Neutron Binary: In a binary neutron star system, the stars lose orbital energy by emitting gravitational waves, ripples in spacetime predicted by Einstein's general relativity. Their orbits shrink and speed up until they collide and merge. The first such merger was detected in gravitational waves and light on August 17, 2017 (GW170817). The footage, credited to astronomhub, shows an animation of two neutron stars merging.
• DD-543 Rotor Hydraulics: Helicopter flight controls change the pitch of main and tail rotor blades to manage lift, pitch, roll and yaw. In most larger helicopters, hydraulic actuators using pressurized fluid assist the pilot in moving the swashplate and linkages, which would otherwise be too hard to move under aerodynamic loads. The footage, credited to eurekahnb, shows a rotor head's linkages moving.
• DD-544 Tidal Forces: The Moon's gravity pulls the ocean into a bulge on the side facing it, and a second bulge forms on the far side because the Moon pulls Earth's center more strongly than the far ocean. As Earth rotates through both bulges, most coasts see two high and two low tides in about 24 hours and 50 minutes, a lunar day. The Sun's gravity adds smaller tides. The footage, credited to explainingtheuniverse, shows an animation of Earth's tidal bulges.
• DD-545 Tesla Bot: Optimus, also called the Tesla Bot, is a humanoid robot in development at Tesla to handle repetitive or unsafe tasks. Announced in 2021, it was specified at about 5 ft 8 in (173 cm) and 125 pounds (57 kg). Tesla showed Optimus Gen 2 in December 2023 with faster walking, less weight and more dexterous hands. The footage, credited to Tesla, shows Optimus walking and handling objects.
• DD-546 Universal Sizing: The observable universe is a sphere set by how far light has traveled since the Big Bang, with a radius of about 46.5 billion light-years. The universe as a whole may be infinite, and accelerating expansion means light from beyond a certain distance will never reach Earth.
• DD-547 Emerald Boas: The northern emerald tree boa (Corallus caninus) is a nonvenomous South American rainforest snake, bright green with white zigzag markings. It is ovoviviparous: eggs develop inside the mother in membranes and the young are born live after about 6-8 months, typically 5-20 per litter, the Reel says. Newborns are often red or orange and turn green later. The footage, credited to thereptilereportofficial, shows an emerald tree boa.
• DD-548 Pendulum Waves: A pendulum wave uses a row of pendulums whose lengths are tuned so each swings at a slightly different frequency. Released together, they drift in and out of phase, producing traveling waves, beats and symmetric patterns, and after a set period they return to their starting alignment. The footage, credited to life_spuzzle, shows a pendulum wave apparatus.
• DD-549 AI Surgery II: Robotic microsurgery systems assist surgeons with procedures on nerves, blood vessels and eye tissue. They use real-time imaging, motion scaling, which turns large hand movements into tiny instrument motions, and tremor filtering; some research systems add AI to assist or partly automate steps. The footage, credited to Innovology, shows a robotic arm operating at small scale.
• DD-550 Lava Land: Submarine volcanoes erupt lava, ash and gas that cool quickly in seawater and pile up into seamounts. With repeated eruptions they can break the surface and form islands or chains, as with Hawaii, and Iceland's Surtsey, which emerged in 1963. The footage, credited to crunchtimearchive, shows lava meeting the sea.
• DD-551 Dog Water: Dogs can't seal their cheeks to suck, so they curl the tongue tip backward into a ladle, plunge it into the water and pull it out fast, drawing up a column of water by inertia. They close their jaws on the column before it falls, lapping several times per second. High-speed video studies, such as a 2015 PNAS paper, showed this. The footage, credited to eurekahnb, shows a dog drinking in slow motion.
• DD-552 Robot Parkour: Atlas is a humanoid robot from Boston Dynamics designed to show advanced mobility: running, jumping, vaulting and even backflips through parkour courses. The hydraulic Atlas was retired in April 2024 and replaced by an all-electric version with enhanced range of motion. The footage, credited to Boston Dynamics, shows Atlas running a parkour course.
• DD-553 Machine's Best Friend: Spot, from Boston Dynamics, is a four-legged robot for autonomous navigation and data collection in difficult environments. Its sensors and cameras let it map surroundings, avoid obstacles, climb stairs and self-right after a fall. Modular payloads enable thermal imaging, acoustic inspection and remote communication in construction, energy and public safety. The footage, credited to Boston Dynamics, shows Spot walking.
• DD-554 Thiel: Peter Thiel is an investor and entrepreneur whose career spans PayPal, Palantir, Facebook and his own venture firm, Founders Fund. Trained in philosophy and law at Stanford, he has also shaped debates through a best-selling startup book, a fellowship that pays young people to skip college, and his funding of a lawsuit that closed a media company.
• DD-555 Andreessen: Marc Andreessen, born July 9, 1971, in Cedar Falls, Iowa, co-created the Mosaic web browser while at the University of Illinois. Mosaic, the first widely used graphical browser, helped popularize the World Wide Web. In 1994 he co-founded Netscape Communications, whose Netscape Navigator dominated the early web. He later co-founded the venture firm Andreessen Horowitz (a16z). The footage, credited to a16z speedrun, shows Andreessen speaking.
• DD-556 Bezos: Jeff Bezos, born in 1964 in Albuquerque, New Mexico, is an American entrepreneur who founded Amazon. After graduating from Princeton University in 1986 in electrical engineering and computer science, he worked on Wall Street, then launched Amazon in 1994 as an online bookstore. It expanded into a vast e-commerce, cloud computing and media company. He also founded the space company Blue Origin. The footage, credited to Personal Finance Insider, NDTV Profit, CNET Highlights, Earth Explore TV, Mr Mozart, KIRO 7 News and Amazon, shows Bezos and Amazon operations.
• DD-557 Laser Weeder: The LaserWeeder from Carbon Robotics is a tractor-pulled implement that uses cameras and computer vision to identify weeds and kill them with high-powered lasers, with no herbicide or hand weeding. The Reel says it carries 30 industrial CO2 lasers and 42 high-resolution cameras, targets over 5,000 weeds a minute with submillimeter precision and covers up to 1.5 acres an hour; those are the maker's figures as quoted. The footage, credited to Carbon Robotics, shows the implement working a field.
• DD-558 OTO 76/62: The OTO Melara 76 mm/62 is a compact, rapid-fire naval gun designed in Italy by OTO Melara (now part of Leonardo) and in service since 1964. Its automatic loading system and revolving magazine let it fire up to about 120 rounds a minute in the Super Rapid version, and it has been adopted by many navies for anti-air, anti-ship and shore-bombardment roles. The footage, credited to vexrmedia, shows the gun's loading mechanism and a mount firing at sea.
• DD-559 Bacterial Flagellum: The bacterial flagellum is a whip-like filament driven by a rotary motor at its base, embedded in the cell envelope. The flow of ions, typically protons or sodium ions, across the membrane turns the motor, spinning the filament like a propeller. Counterclockwise rotation bundles the flagella so the cell runs forward; switching to clockwise makes it tumble and reorient. The footage, credited to Smart Biology, shows an animation of the flagellar motor.
• DD-560 Hurricane Helene: Hurricane Helene made landfall in Florida's Big Bend on September 26, 2024, and moved inland, bringing extreme rainfall to the southern Appalachians. Western North Carolina, including Asheville, Swannanoa and Chimney Rock, saw catastrophic flooding and landslides; some locations recorded over 30 inches of rain, and the storm ranks among the deadliest in the state's history. The footage, credited to Matt Van Swol, shows flood damage in the North Carolina mountains.
• DD-561 Granular Flow: In a granular flow, loose and fragmented rock and debris behave like a fluid and move rapidly downslope under gravity. Such flows often start when an unstable slope or slow-moving slide breaks apart, with triggers such as heavy rain, earthquakes or erosion. They can reach high speeds and travel long distances, endangering infrastructure and lives. The footage, credited to Centinela35, shows a rockslide flowing down a hillside.
• DD-562 Skypark: The Reel describes Vaisakhi Sky Park, a residential project by Vaisakhi Developers in Yendada, Visakhapatnam, a port city in Andhra Pradesh, India. According to the Reel, it covers about 10.35 acres with seven 20-story towers and 1,119 three-bedroom apartments of 1,396 to 2,765 square feet; I could not confirm these figures independently. The footage, credited to Vaisakhi Developers, shows renderings and views of the site.
• DD-563 Wasp the Builder: Paper wasps and their relatives build nests from wood fibers chewed and mixed with saliva into a papery pulp. In spring a queen starts the nest on a sheltered surface, builds the first hexagonal cells, lays eggs and raises the first workers, which then take over expanding the nest with more cells and, in many species, a protective outer envelope. The footage, credited to in_sideout._, shows a wasp building a nest.
• DD-564 Adelson: Miriam Adelson, born in 1945 in Tel Aviv, is an Israeli-American physician, philanthropist and businesswoman. She studied microbiology at the Hebrew University of Jerusalem and medicine at Tel Aviv University, researched addiction at Rockefeller University, and co-founded substance-abuse clinics in Tel Aviv and Las Vegas. The Reel puts her net worth at $27 to $35 billion as of 2025, a range consistent with published rich-list estimates. The footage, credited to United Hatzalah, shows Adelson at an event.
• DD-565 Gates: Bill Gates, born in 1955 in Seattle, co-founded Microsoft, which became the leading personal-computer software company. He stepped down as CEO in 2000 and left the board in 2020. The Reel puts his 2025 net worth at about $104.6 billion and highlights his philanthropy through the foundation he co-founded, which works on health, education and poverty and was renamed the Gates Foundation in 2024. The footage, credited to Leon - 4k Nature Film, shows scenic footage.
• DD-566 Lens Crafter II: To fit glasses, an optician uses an edger machine that traces the specific frame, then grinds the prescription lens blank down to that shape, adjusting for the material; some lenses need specialized tools. The footage, credited to Eurekahnb, shows lenses being cut and ground in an edger.
• DD-567 Hallgrímskirkja: Hallgrímskirkja is a Lutheran parish church of the Church of Iceland, on the Skólavörðuholt hill near the center of Reykjavík. At 74.5 m (244 ft), it is the largest church in Iceland and the second-tallest building in the country. It is named after Hallgrímur Pétursson (1614–1674), the poet and pastor who wrote the Passion Hymns. State Architect Guðjón Samúelsson was commissioned to design it in 1937. He is said to have modeled it on Iceland's landscape, especially columnar basalt formations like those at Svartifoss. Architectural historians usually classify it as Expressionist, and Copenhagen's Grundtvig's Church is often cited as an influence. Building it took 41 years. Construction began in 1945, the crypt beneath the choir was consecrated in 1948, and the tower and its wings were finished in 1974. The nave was consecrated on October 26, 1986. The nave is plain and pale, and a lift takes visitors up the tower to a viewing deck. The main concert organ was built by Johannes Klais of Bonn and inaugurated in December 1992. It is 15 m tall, weighs about 25 tonnes and has 72 stops and 5,275 pipes. The statue of Leif Erikson in front of the church is older than the building: the United States gave it to Iceland for the 1930 millennium of the Althing, Iceland's parliament. The footage shows the tower at dusk with the statue, the main doors, the façade against a sunrise, and a winter aerial view.
• DD-568 Commercial Supersonics: Concorde was an Anglo-French supersonic airliner. A UK–France treaty of November 29, 1962 launched it, and it was developed and built by Sud Aviation (which became part of Aérospatiale in 1970) and the British Aircraft Corporation. The first prototype flew from Toulouse on March 2, 1969. Air France and British Airways began scheduled service on January 21, 1976, and New York JFK flights started on October 17, 1977. It had an ogival delta wing, a droop nose for landing visibility and four Rolls-Royce/Snecma Olympus 593 turbojets with afterburners. Its regular cruise was Mach 2.02, about 1,340 mph (2,150 km/h), with a maximum altitude of 60,000 ft. A New York–Paris flight took just under 3.5 hours, compared with about seven to eight hours on a subsonic jet. Its top speed was capped by heat: the aluminum skin could only tolerate about 127 °C. Only 20 were built, and Air France and British Airways were the only customers, with seven airframes each. Sonic booms kept supersonic flights over the sea. On July 25, 2000, Air France Flight 4590 crashed after takeoff from Paris, killing 113 people. It was Concorde's only fatal accident, and service resumed in November 2001. Both airlines retired the aircraft in 2003, citing rising maintenance costs, lower demand after the crash and the post-9/11 slump. Air France's last commercial flight was on May 30, 2003, and British Airways' was on October 24, 2003. Eighteen are preserved. No supersonic airliner has flown passengers since. On January 28, 2025, Boom Supersonic's XB-1 demonstrator broke the sound barrier over the Mojave Desert, a test for its planned Overture airliner. The footage shows a British Airways Concorde landing at night with its nose drooped.
• DD-569 Food Recycling: The footage shows a Chinese plant processing expired packaged food. Workers shovel bags of snacks onto conveyors, a machine strips the wrappers, and the food comes out as an orange meal. Chinese manufacturers sell these de-bagging lines for expired packaged food. One maker says its line opens bags, separates food from plastic by air and screening, and sends the food on to feed processing. Chinese media report that feed factories buy expired or near-expiry stock such as biscuits and mooncakes by the ton. In a September 2026 report, a Hebei feed-plant worker said moldy or spoiled products are rejected. The food is crushed and dried, tested against feed standards and blended with corn and soybean meal. Restaurant and household kitchen waste is a separate stream with stricter rules. After African swine fever spread through China in 2018, the government banned feeding food waste to pigs. Reuters reported that the ban pushed waste processors toward options such as insect farms. Kitchen waste is mostly treated by anaerobic digestion for biogas, composting, or conversion into fuel and fertilizer, according to a review by the French research agency CIRAD. On April 29, 2021, China passed its Anti-Food Waste Law, which took effect the same day. In 2025, according to the Wilson Center's New Security Beat, China launched 20 city pilot programs to collect and treat food waste for animal feed, partly to cut its reliance on imported soybeans.
• DD-570 Baikonur Cosmodrome: Buran was the Soviet Union's reusable spaceplane, built in response to the US Space Shuttle and launched on the Energia rocket. The orbiter Buran (1K) flew once, uncrewed, on November 15, 1988. It lifted off from Baikonur, circled Earth twice in 3 hours 25 minutes and landed automatically on the cosmodrome's runway. Funding dried up as the Soviet Union broke apart, and the program was suspended in 1993. The flown orbiter didn't survive. It was stored in Baikonur's main assembly building, MIK 112, which was originally built for the N1 Moon rocket. On May 12, 2002, the roof collapsed during repair work, killing eight workers and destroying Buran along with Energia hardware. The craft in the famous photos are two others, kept in a separate Assembly and Fueling Complex (MZK) at Site 112A. According to RussianSpaceWeb, the MZK is 150 m long, 80 m wide and 70 m high. Inside are orbiter 1.02, the second flight article, which was about 95–97% complete and never flew, and OK-MT, an engineering mockup. Both were moved there in 1995. Their doors later jammed, and RussianSpaceWeb calls the building a sarcophagus for both vehicles. Wikipedia, citing CNN, reports that a Russian-Kazakh company, Aelita, has owned them since 2005. Baikonur is in Kazakhstan. Under a 1994 agreement, Russia leases the whole Baikonur complex for $115 million a year, and the lease has since been extended to 2050. The footage looks down on an orbiter between rusting work platforms in the MZK, then shows the hall and the vehicles from the side.
• DD-571 Bunker Valentin: Bunker Valentin is a bomb-proof U-boat factory that the German navy (Kriegsmarine) built on the Weser River at Bremen-Farge, in Bremen's Rekum district. With Allied bombers pounding open shipyards, the plan was to assemble Type XXI submarines there from prefabricated sections, on an assembly line. Construction ran from 1943 to March 1945. The memorial says it was the second-largest above-ground bunker in Europe. Wikipedia gives its size as about 426 m long and up to 97 m wide, with a height of 22.5 to 27 m. Its walls are about 4.5 m thick, and its roof is 4.5 m thick, rising to 7 m in one section. According to the memorial, up to 10,000 forced laborers built it: civilians from across Europe, Soviet prisoners of war, Italian military internees, concentration-camp prisoners from the nearby Neuengamme subcamp at Farge, and Gestapo labor-camp inmates. They worked 12-hour shifts day and night. The memorial puts the death toll at about 1,600, from hunger, disease and arbitrary killings, and 1,144 victims are known by name. On March 27, 1945, RAF 617 Squadron bombed the bunker with Grand Slam and Tallboy bombs. Two Grand Slams broke through the thinner western roof. Building stopped soon afterwards, and no submarine was ever finished there. After the war it was used for bomb tests. From the 1960s to 2010, the German navy (Bundesmarine) used it as a depot. A memorial sculpture, 'Vernichtung durch Arbeit' ('Extermination through Labour'), was erected in 1983. The bunker opened as the Denkort Bunker Valentin memorial on November 8, 2015. The footage shows the overgrown exterior walls and the dim interior bays behind fencing.
• DD-572 Unlimited Bladeworks: The Didgori memorial stands on the meadows of Mount Didgori, about 40 km west of Tbilisi in the Trialeti Range. It marks the Battle of Didgori, fought on August 12, 1121. King David IV of Georgia, known as David the Builder, defeated a much larger Muslim coalition led by the Artuqid commander Ilghazi, acting for the Seljuk sultan. Medieval chroniclers gave wildly inflated figures for Ilghazi's army. Modern Georgian historians estimate 100,000 to 250,000 men, against roughly 55,000 on David's side, a force that included Kipchak allies and a small number of Frankish knights. Accounts credit David's victory to surprise and the terrain. The Georgian Chronicles call it the 'miraculous victory'. The next year, 1122, David took Tbilisi and made it his capital. The battle is traditionally seen as opening Georgia's medieval golden age. Sculptor Merab Berdzenishvili and architect Tamaz Gabunia designed the memorial, which went up in the early 1990s and won them the State Prize of Georgia in 1995. Dozens of giant swords are driven into the ground like crosses. Colossal sculptures of warriors lie scattered across the meadows, and at the center stands a concrete column shaped like a deda bodzi, the central pillar of a traditional Georgian house. Since 1997, a commemoration called Didgoroba has been held at the monument every August 12. The footage shows the swords against a blue sky and spread across the grassy ridges, with wildflowers in the foreground.
• DD-573 Buzludzha: The Monument House of the Bulgarian Communist Party stands on Buzludzha Peak in the Balkan Mountains (Stara Planina) of central Bulgaria, near the Shipka Pass. Bulgaria's communist government built it to commemorate an 1891 meeting nearby. There, socialists led by Dimitar Blagoev founded the party that became the Bulgarian Social Democratic Party, a forerunner of the Bulgarian Communist Party. Architect Georgi Stoilov designed it. Construction began on January 23, 1974, after the summit was leveled with explosives, lowering it from 1,441 m to 1,432 m. Party leader Todor Zhivkov opened it on August 23, 1981. The building is a circular, saucer-shaped hall of concrete, steel and glass beside a 70 m tower set with red-glass stars. Inside, about 937 m² of mosaics depicted the party's history and figures such as Marx and Lenin. Maintenance stopped after communism ended in 1989, and the building was stripped and left open to the weather, so part of the mosaic art has been lost. Wikipedia notes that earlier rescue proposals were mostly political and tied to the Bulgarian Socialist Party. In 2018, Europa Nostra listed it among Europe's seven most endangered heritage sites. The Buzludzha Project Foundation, founded in 2015 by architect Dora Ivanova, received a Getty Foundation grant in 2019 for a conservation management plan. A second grant in 2020 paid for emergency stabilization of the mosaics. The foundation describes the building today as a symbol of conflict between people with different views of the past. The footage shows the frost-covered peak, the saucer roof and the tower's red star at sunrise.
• DD-574 Blue Hour: The blue hour is the period of twilight just before sunrise or just after sunset, when the Sun is a few degrees below the horizon. Only indirect sunlight reaches the ground, and ozone absorption and scattering leave mostly blue wavelengths of the visible spectrum, so the sky and landscape take on a deep blue tint. How long it lasts depends on season and geographic location. The footage, credited to eastern_european_aesthetic, shows a snowy street at dusk.
• DD-575 Maslenitsa: Maslenitsa, also called Butter Week or Cheesefare Week, is an Eastern Slavic religious and folk holiday observed mostly in Russia, Ukraine and Belarus, and by their diaspora communities. It falls in the last week before Great Lent, the eighth week before Eastern Orthodox Easter, so its date moves every year. In 2025 it ran from February 24 to March 2. In 2026 it ran from February 16 to 22. Wikipedia describes it as a Christian observance that keeps many elements of older Slavic mythology. Meat is already off the table that week for observant Orthodox Christians, but butter, cheese, eggs and other dairy are still allowed, so the signature food is blini, thin pancakes. Ukrainians and Belarusians also make varenyky and syrniki. Customs include visits to family, sleigh rides, sledding, snowball fights, the storming of a snow fortress and, in some regions, a different tradition for each day. The week ends on Forgiveness Sunday, when people ask one another's forgiveness. A straw effigy, Lady Maslenitsa, is stripped of her finery and burned in a bonfire, and the next day, Clean Monday, Lent begins. Large public celebrations faded after 1917 under Soviet state atheism, returned in a more secular form in the 1960s and 1970s, and grew again after the Soviet Union ended. Moscow has held a yearly festival near Red Square since 2002. The footage shows masked revelers in horned and antlered costumes and huge wooden towers burning in the snow in front of a crowd.
• DD-576 Ayam Cemani: The Ayam Cemani is a rare chicken breed from the island of Java in Indonesia. In Indonesian, 'ayam' means chicken, and the Javanese word 'cemani' means thoroughly black. The breed has probably been kept since the 12th century for religious and mystical purposes. It was described by Dutch colonial settlers, and Dutch breeder Jan Steverink first imported it to Europe in 1998. The breed standard calls for black feathers, beak, tongue, comb and wattles, and even the meat, internal organs and bones are black or gray. Roosters weigh about 2 to 2.5 kg and hens 1.5 to 2 kg. The color comes from fibromelanosis, a dominant trait in which pigment cells spread into the skin, connective tissue and organs. In 2011, a team led by Leif Andersson traced it to a complex rearrangement on chromosome 20 that duplicates the endothelin 3 gene (EDN3). Extra EDN3 activity drives the growth of melanocytes, the pigment cells. Silkie chickens, Korea's Ogye and India's Kadaknath share the same mutation, and a 2017 genome study comparing Cemani and Silkie concluded that it arose once and spread among breeds. The pigment doesn't reach the blood, which is red as in any chicken, despite a popular myth. The footage shows a row of glossy black birds on a perch and black hens with chicks in straw.
• DD-577 Berlin Heart: The Berlin Heart EXCOR Pediatric is a pulsatile, air-driven ventricular assist device (VAD) that keeps infants and children with severe heart failure alive, usually while they wait for a heart transplant. It's paracorporeal: one or two blood pumps sit outside the body on the chest wall, connected by cannulas (tubes) through the skin to the heart's atrium or ventricle and to the great arteries. Each pump is a clear chamber split by a flexible membrane. A driving unit pushes and pulls air behind the membrane, so blood is drawn in and pushed out, and valves keep it flowing one way. Pumps come in small sizes for babies. The device grew out of the German Heart Institute Berlin. In 1990, its surgeons kept an 8-year-old boy alive on an adult-sized 50 mL pump until a transplant, and in 1992 an infant system with a 10 mL pump was implanted there for the first time. On December 16, 2011, the US FDA approved the EXCOR Pediatric under a Humanitarian Device Exemption as a bridge to transplant, after a 17-hospital study led by Texas Children's Hospital. The approved system uses the stationary Ikus driver. The smaller, battery-powered EXCOR Active driver weighs about 15 kg and runs at least 5 hours on batteries. In the US it's still an investigational device used under an FDA-approved study that began in November 2022. A 2026 JACC report found no major device malfunctions among its first 40 study patients. The footage shows a red blood pump with its connectors and a clear pump chamber lying on a hospital blanket.
• DD-578 Second Impact: Ceres is the largest object in the main asteroid belt between Mars and Jupiter. Giuseppe Piazzi discovered it on January 1, 1801, and it was first hailed as a planet, then called an asteroid. Since August 24, 2006, it has been classed as a dwarf planet, the only one inside Neptune's orbit, though it also keeps its asteroid number, 1 Ceres. NASA's Dawn spacecraft orbited it from March 6, 2015, to the end of the mission on November 1, 2018. Dawn measured a mean diameter of 939.4 km and a mass of about 9.38 × 10^20 kg, about 40% of the whole asteroid belt's mass. It found a crust of ice, salts and hydrated minerals over a muddy interior, with brines that reach the surface in bright spots like those in Occator Crater. Ceres's orbit stays between 2.55 and 2.98 astronomical units from the Sun, well outside Earth's, so the Reel's collision is purely hypothetical. Still, the numbers are extreme. Anything falling to Earth hits at no less than Earth's escape speed, about 11.2 km/s. At 11 to 20 km/s, Ceres would carry about 6 × 10^28 to 2 × 10^29 joules of kinetic energy. That's my own back-of-envelope estimate (½mv²), not a published figure. A 2022 review in Nature Reviews Earth & Environment puts the Chicxulub impact that ended the age of dinosaurs at about 10^23 joules, so Ceres would deliver roughly half a million to two million times as much. Sleep and colleagues estimated in 1989 that an impactor of roughly 350 to 440 km could boil away Earth's oceans, and later models put the threshold nearer 700 km. Ceres is bigger than either. The footage is computer animation of a huge body striking Earth from orbit, with a glowing crater and a fireball sweeping across the planet.
• DD-579 Uranium Ural: Ural is a Project 22220 nuclear-powered icebreaker, the third ship of the class after Arktika and Sibir. It's operated by Atomflot, part of Russia's state nuclear corporation Rosatom, and registered in Murmansk. Baltic Shipyard in Saint Petersburg laid its keel on July 25, 2016, and it was launched on May 25, 2019. Its reactors had already been lifted aboard while it was on the slipway. Delivery was planned for 2020 but slipped to 2022 because of delays with its domestically made steam turbines. After sea trials in October 2022, its flag was raised on November 22, 2022, and on December 2 it left Murmansk on its first icebreaking mission, to the Kara Sea. The ship is 172.7 m long and 34 m wide. Two 175-megawatt RITM-200 pressurized-water reactors, fueled with uranium-235 enriched to up to 20%, make steam for two turbogenerators. Their electricity drives three 20-megawatt motors, each turning a 6.2 m four-bladed propeller, for 60 megawatts in total. At full power in deep water, the design calls for breaking level ice 2.8 m thick at a steady 1.5 to 2 knots. By taking on or pumping out ballast water, the crew can vary the draft between about 9 m and 10.5 m. That lets the same ship work the deep Northern Sea Route and the shallow estuaries of Siberian rivers such as the Yenisei. The name had been chosen once before, for the last Arktika-class icebreaker in 1989, which was renamed 50 Let Pobedy during construction. The footage shows Ural's red, white and blue superstructure and dark-blue hull, marked 'УРАЛ' and 'РОСАТОМФЛОТ', moving through snow-covered ice at dusk.
• DD-580 Bathypterois grallator: Bathypterois grallator, the tripod fish or tripod spiderfish, is a deep-sea fish in the family Ipnopidae. George Brown Goode and Tarleton Bean described it in 1886. It lives on continental slopes and abyssal plains in the Atlantic, Pacific and Indian oceans, roughly between 40°N and 40°S, at depths of 878 to 4,720 m and water temperatures of 2.7 to 13.5 °C. It's the largest member of its genus, commonly over 30 cm long and up to about 43 cm. The lower lobe of its tail fin and both pelvic fins end in greatly elongated rays, up to about a meter long, or roughly three times its body length. When it settles, it lands on its pelvic fins first and then lowers its tail ray, standing on the three like a tripod. The rays are flexible when it swims but stiff when it stands, and researchers have suggested that the fish pumps fluid into them to stiffen them. Standing facing into the current, it waits for food to drift past and uses the tips of its pectoral fins to feel for prey, since its eyesight is very poor. Small tripod fish eat mostly copepods, amphipods and other small crustaceans. Larger ones, above about 24 cm, eat mostly small fish and decapods by weight. Each fish is a simultaneous hermaphrodite and may be able to fertilize its own eggs, which helps where mates are scarce. The IUCN lists it as Least Concern. The footage, credited to the Schmidt Ocean Institute, shows a pale tripod fish drifting and standing on long fin rays over a dark, sandy seafloor.
• DD-581 Sprinkle Of Truth: The sprinkler in the footage is an impact sprinkler, the classic 'tick-tick-tick' design on farm risers. Water under pressure leaves the main nozzle as a jet. A spring-loaded drive arm sits in front of it with a small deflector, or spoon, that dips into the stream. The jet knocks the arm aside, the spring swings it back, and it strikes the sprinkler body. Each strike nudges the head around a few degrees, so the jet sweeps a circle (or an arc, with trip stops) in small, even steps. Breaking up the stream this way also spreads the water more evenly across the wetted area. Other rotary sprinklers use a turbine or gear drive instead, as the Reel says. Orton Englehart, a citrus grower in Glendora, California, built the horizontal-action impact drive sprinkler in his shed around 1932 to 1933. His neighbor Clem LaFetra urged him to patent it. The application was filed on December 18, 1933, and US Patent 1,997,901 was granted on April 16, 1935. Englehart preferred farming and sold the rights to Clem and Mary LaFetra, who began production in their family barn on October 13, 1935, under the name Rain Bird. In 1990, the American Society of Agricultural Engineers named the Rain Bird impact sprinkler a historic landmark of agricultural engineering, crediting it with helping sprinkler irrigation spread to more than 50 million acres worldwide. The footage shows an impact sprinkler on a tripod stand in a sandy field, its arm swinging as the jet sprays across the sand.
• DD-582 Starbase: Starbase is SpaceX's Starship build, test and launch site on the Boca Chica peninsula in Cameron County, Texas, about 20 miles east of Brownsville and close to the Mexican border. The area began as Kennedy Shores, a small subdivision founded in 1967 and later renamed Kopernik Shores; by the 2000s it was better known as Boca Chica Village and had only a handful of permanent residents. SpaceX started buying land there in 2012 and announced in August 2014 that Boca Chica would be its South Texas launch site, with limited construction that year and much larger work from about 2018. Prototype flight testing began in 2019. Elon Musk announced plans for a city called Starbase in March 2021, and SpaceX petitioned Cameron County for an incorporation vote in 2024. On May 3, 2025, voters approved incorporation 212 to 6, according to Cameron County's election results, and Bobby Peden, SpaceX's vice president of Texas test and launch, was elected mayor unopposed. The county commissioners court certified the result on May 20, 2025, making Starbase a Type C general-law city with a mayor and two commissioners. Supporters, including local economic development officials, point to jobs and tourism; some residents and conservation groups have raised concerns about land use, launch effects and the nearby wildlife refuge. The footage shows Starship hardware and the tall assembly buildings at the site.
• DD-583 Silk Harvest: Forced silking, or reeling, is a standard way for researchers to collect spider silk. In the Oxford Silk Group's demonstration, a golden orb-weaver, Nephila edulis, is sedated with carbon dioxide and pinned gently in place. A thread is pulled from the spinnerets with tweezers, fixed to a spool, and a motor reels it in. The group says 30 to 80 meters can be collected in one go, after which the spider goes back to its web. The silk drawn this way is mainly major ampullate (dragline) silk, plus some minor ampullate silk. Each silk type comes from its own gland, and a female of this species can make up to six types. Forced silking isn't identical to natural spinning: a 2004 study in Biomacromolecules found that restrained spiders brake the line hard, putting the fiber under far more stress than a spider descending on its dragline, which can change the silk's properties. Scale is the hard part. For the golden spider-silk cape shown at London's V&A from January 25 to June 5, 2012, Simon Peers and Nicholas Godley's team in Madagascar harnessed wild-caught golden orb-weavers 24 at a time and released them at the end of each day. The cape used the silk of 1.2 million spiders, and the V&A says about 23,000 spiders yield around an ounce of silk. The footage is the Oxford Silk Group's reeling demonstration.
• DD-584 Flying Bike: From the footage, I identify the machine as the de Lackner HZ-1 Aerocycle, a one-man 'personal helicopter' built for the US Army in the mid-1950s. It grew out of work by Charles H. Zimmerman of NACA on kinesthetic control: with the rotors below the pilot, the craft could be steered by shifting body weight, much like riding a bicycle or a surfboard. The Aerocycle had a cross-shaped frame with the pilot standing on a platform in a safety harness, above two contra-rotating 15-foot rotors driven by a 40-horsepower Mercury outboard motor. A motorcycle-style twist-grip throttle sat on the handlebars, and airbags on each arm plus a central rubber float served as landing gear. It made its first tethered flight on November 22, 1954, and its first free flight in January 1955 at the Brooklyn Army Terminal in New York. Early tests suggested untrained soldiers could learn to fly it in about 20 minutes, and the Army ordered 12. After testing moved to Fort Eustis, Virginia, in 1956, test pilot Capt. Selmer Sundby found it much harder to fly than expected. Two crashes, in which the rotors intermeshed and shattered, and the wider failure of the 'personal lifting device' concept ended the program. One HZ-1 survives at the US Army Transportation Museum at Fort Eustis.
• DD-585 Trocar Cows: Bloat, or ruminal tympany, is overdistension of the rumen and reticulum with the gases of fermentation. The Merck Veterinary Manual describes two forms. In frothy (primary) bloat, gas is trapped in a stable foam mixed with the rumen contents, often on legume pasture, and the usual treatment is an antifoaming agent given by tube. In free-gas (secondary) bloat, gas collects above the contents because something, such as an esophageal obstruction, stops the cow from belching it up. Free-gas bloat is quickly relieved by passing a stomach tube or by inserting a trocar and cannula through the left flank into the rumen. A standard trocar is often too narrow to let stable foam escape, and a life-threatening case may need an emergency rumenotomy. The gas itself is mostly carbon dioxide: a 1974 review gives 45 to 70% CO2 and 20 to 30% methane, and a 1997 study of grazing dairy cows measured about 65 to 76% CO2 and 22 to 31% methane. The methane is why the escaping gas can be lit. The footage shows a cannula in a cow's flank with the gas burning as a blue flame. Lighting it is a demonstration, not part of the treatment.
• DD-586 Pulse Jar: A pulse jet engine burns a fuel-air mixture in rapid, repeated pulses. Jar versions improvise the idea: a small opening lets air in, a flammable vapor such as alcohol is added, and ignition makes the burning gas build pressure and rush out of the opening, often pulsing. The Reel itself calls this a highly dangerous experiment. The footage, credited to eurekahnb, shows a burning jar demonstration.
• DD-587 Avian Siblicide: Siblicide is the killing of a young animal by its siblings, and it is best known in birds. Biologists split it into two kinds. In obligate siblicide, one chick almost always kills the other, whatever the food supply. Masked boobies (Sula dactylatra) and Nazca boobies (Sula granti) are classic examples: the first-hatched A-chick starts pecking its sibling as soon as it hatches and usually kills it or pushes it out of the nest scrape within two days. In facultative siblicide, siblings fight but killing depends on conditions. Blue-footed booby (Sula nebouxii) chicks, for instance, usually kill a sibling only when food is short. More bird species are facultatively siblicidal than obligately so. Hatching asynchrony sets up the contest: the eggs are laid days apart, so the older chick gets a head start in size and strength. Cattle egrets (Bubulcus ibis) add higher hormone levels in the first eggs. A leading explanation for why parents lay a second egg at all is the insurance egg hypothesis, proposed by Dorward in 1962: the extra egg is a backup in case the first fails. Parents' behavior matters too: in a cross-fostering study, masked booby chicks raised by blue-footed booby parents committed siblicide less often. The footage shows a naked hatchling heaving a nestmate up and over the rim of a small nest.
• DD-588 Central Limits: The Galton board, also called the quincunx or bean machine, has interleaved rows of pegs above a row of bins. Each bead that falls through bounces left or right at each peg. The number of paths to each bin follows Pascal's triangle, so the bead counts follow a binomial distribution. With many rows and many beads, that binomial distribution approaches the normal distribution, the bell curve. That's a special case of the central limit theorem known as the de Moivre–Laplace theorem. Francis Galton designed the board for a Royal Institution discourse on February 27, 1874. He described a two-stage version in an 1877 letter to George Darwin and celebrated the 'Law of Frequency of Error' in his 1889 book Natural Inheritance. He used it to illustrate his ideas about heredity and regression toward the mean ('reversion to mediocrity'), ideas that were part of his eugenics. The bell shape isn't automatic. A tilted board or biased pegs shift and skew it, and other peg shapes give other distributions: Jacobus Kapteyn built a board that produces a log-normal curve. Large Galton boards designed by Charles and Ray Eames appeared in the IBM Pavilion at the 1964–65 New York World's Fair. The footage shows a modern desktop Galton board with a printed bell curve, its beads settling into the shape.
• DD-589 Microwave Metal: A microwave oven's magnetron fills the metal cooking cavity with microwaves at about 2,450 MHz, with a wavelength of about 12 centimeters. Food absorbs them, mostly through its water, fats and sugars. Metal reflects them instead, and a conductor in the cavity acts like an antenna: the oscillating field induces currents and voltages in it. The field is strongest at sharp points, edges, corners and narrow gaps. There it can become strong enough to ionize the surrounding air, which then conducts and glows as a spark or arc, jumping to the oven wall or to another piece of metal. MIT materials scientist Caroline Ross compares it to lightning. That's why a pile of nails or screws, crumpled foil, metal twist ties or gold-trimmed china spark so readily. Smooth, rounded metal is less prone to arcing but not risk-free. The USDA says small amounts of new, smooth foil can be used to shield food, if the manufacturer's manual allows it, the foil is shaped smoothly to the food, and it stays at least an inch from the oven walls. It also says to remove it at once if arcing starts. Arcing can damage the oven and start a fire. The footage shows a heap of nails inside a microwave, sparking and glowing as the plate turns.
• DD-590 The Motherland Calls: The Motherland Calls is a reinforced-concrete war memorial on Mamayev Kurgan, a hill in Volgograd (formerly Stalingrad), Russia. It is the centerpiece of a memorial complex to the Battle of Stalingrad, fought between the Soviet Union and Nazi Germany from July 1942 to February 1943 and won by the Soviets at enormous cost. Sculptor Yevgeny Vuchetich designed it with architect Yakov Belopolsky, and structural engineer Nikolai Nikitin led construction, which began in 1963. The statue shows a female personification of the homeland striding forward with a sword raised in her right hand and her left arm outstretched, a design inspired by the ancient Greek Winged Victory of Samothrace. The figure itself is 52 meters tall; with its pedestal and sword it reaches 85 meters (279 feet). Wikipedia, citing historian Scott Palmer, reports that Nikita Khrushchev wanted it taller than the Statue of Liberty. The sword caused trouble: the original stainless-steel blade swayed in the wind and was replaced in 1972 with a slotted steel version. The complex was dedicated on October 15, 1967, timed for the 50th anniversary of the October Revolution. It was the world's tallest statue until 1989, and Wikipedia describes it as still the tallest statue in Europe when the pedestal is counted. A major restoration was finished in 2020, and the complex has been on UNESCO's tentative list since 2014. The footage shows the statue on its hilltop above the city and the Volga.
• DD-591 Sandy Scaridae: Parrotfish are the family Scaridae, about 90 species of reef fish named for their fused, beak-like teeth. They bite and scrape the surfaces of dead coral and rock, mainly for the algae and other microscopic organisms growing on and in them, and swallow chunks of the calcium-carbonate reef along the way. A second set of tooth plates in the throat, the pharyngeal mill, grinds that material down, the digestible part is absorbed, and the rest comes out as fine white sand. NOAA says parrotfish can produce hundreds of pounds of sand a year, and a large bumphead parrotfish may produce several hundred pounds. The University of Hawaii's Exploring Our Fluid Earth estimates that up to 70% of the sand on white beaches in the Caribbean and Hawaii was excreted by parrotfish. A 2021 study on a Maldivian reef put individual production anywhere from under 3 to over 5,000 kilograms a year, depending on species and size. Grazing also keeps algae from overgrowing reefs, which is why parrotfish are seen as important to reef health. The footage shows a blue-and-purple parrotfish grazing over rocky reef.
• DD-592 Duga: Duga, Russian for 'arc', was a Soviet over-the-horizon radar system that formed part of the USSR's early-warning network against ballistic missiles. Over-the-horizon radar bounces shortwave signals off the ionosphere to see far beyond the line of sight. After an experimental Duga near Mykolaiv proved the idea, two operational systems were built: Duga-1 in what is now northern Ukraine, then the Ukrainian SSR, and Duga-2 in eastern Siberia near Komsomolsk-on-Amur. Duga-1 split its transmitter and receiver about 60 kilometers apart. The giant receiving array stands in the closed town of Chernobyl-2, a few kilometers from the Chernobyl nuclear plant, and the transmitters were near Liubech. From July 1976 to December 1989, its pulses, at up to about 10 megawatts, swept across the shortwave bands as a sharp tapping, usually 10 times a second. Listeners worldwide called it the 'Russian Woodpecker', and it disrupted broadcasts, amateur radio and aviation communications, drawing thousands of complaints. NATO reportedly gave it the reporting name STEEL WORK or STEEL YARD. The Chernobyl antenna is about 700 meters long and 150 meters high. The signals faded in the late 1980s and stopped in 1989; the reasons were never made public. The abandoned array, inside the Chernobyl Exclusion Zone, is now a listed monument in Ukraine. The footage shows its rusting steel towers and antenna elements.
• DD-593 Imploder: The human body is mostly water, and water barely compresses. Divers survive great depths because the pressure on them rises gradually and evenly. The weak points are air-filled spaces such as the lungs, middle ears, sinuses and bowel, where gas can be squeezed or forced to expand, a kind of injury called barotrauma. Explosions cause harm in a related way. Blast injury medicine classes the pressure wave itself as primary blast injury, and gas-filled organs, especially the lungs, ears and gut, are the most vulnerable. Underwater, a blast wave travels farther and faster than in air, so it is more dangerous at a given distance. Deep-sea pressure is immense: it rises by about one atmosphere for every 10 meters of seawater, so at the roughly 3,800-meter depth of the Titanic wreck it is about 380 atmospheres, or around 5,500 psi. If a pressure hull fails at that depth, the surrounding water rushes in within milliseconds. That happened to the submersible Titan on June 18, 2023, killing all five people aboard. The US Coast Guard's Marine Board of Investigation reported on August 5, 2025, that the disaster was preventable and blamed mainly OceanGate's design, testing and safety practices. The footage is a stylized CGI figure made of red beads breaking apart, not real injury footage.
• DD-594 Deluge Days: NASA's Stennis Space Center in Mississippi tests rocket engines and stages by bolting them to giant stands and firing them in place. Because the hardware doesn't move, the exhaust, which NASA says can reach 6,000 degrees Fahrenheit (about 3,300 degrees Celsius), pours into the same flame deflector for the whole test. Water keeps it from melting. Stennis's high-pressure industrial water system draws on a 66-million-gallon reservoir. For the Space Launch System core stage's Green Run tests in 2020 and 2021, the B-2 stand could receive 335,000 gallons a minute at 300 psi, enough to fill an Olympic pool in about two minutes. Most of it cooled the exhaust through the deflector, and about 87,000 to 92,000 gallons a minute formed a curtain of water to damp noise and vibration. A typical 500-second RS-25 engine test uses about 5 million gallons. Launch pads use water too. At Kennedy Space Center's Pad 39B, the ignition overpressure and sound suppression system dumps about 400,000 gallons in under 30 seconds, peaking around 1.1 million gallons a minute. NASA says SLS produces about 176 decibels at liftoff. The footage looks like a pad water-flow test, with columns of water erupting in front of a steel launch structure.
• DD-595 heat.: Rocket engines produce intense heat by burning propellants such as liquid hydrogen and liquid oxygen. The Reel says liquid-fueled engines like the Space Shuttle's produce exhaust above 3,000 degrees Celsius, hot enough to melt steel, and release energy at up to 10 gigawatts; I left the power figure attributed to the Reel. Launch pads use flame trenches to divert exhaust and water deluge systems to absorb heat and sound. The footage, credited to astronomy4u, shows a rocket launch.
• DD-596 Chordodes Formosanus: Chordodes formosanus is a horsehair worm (phylum Nematomorpha) first described in 2011 by Ming-Chung Chiu and colleagues from specimens taken from Hierodula mantises in Taiwan and Japan. Later surveys found it in other mantises and in long-horned grasshoppers too. Horsehair worms live as adults in water. Females lay strings of eggs there, and the larvae infect aquatic insect larvae and form cysts inside them. When those insects grow up and fly to land, a mantis or cricket that eats one picks up the cyst. The worm then grows inside the host's body cavity until it fills much of the abdomen. When it's mature, the infected host heads for water, and the worm emerges and swims off to mate. Researchers have long linked this water-seeking behavior to the parasite, but exactly how it works is still being studied. A 2023 Current Biology study of the related species Chordodes fukuii found more than 1,400 worm genes that closely match mantis genes, evidence of horizontal gene transfer. Many of those genes became more active during manipulation, which suggests they may help the worm influence its host. Adult horsehair worms of different species range from a few centimeters to over 2 m long, though most are 20 to 40 cm. The specimens measured in the 2011 description of C. formosanus were about 7 to 28 cm. The footage shows a green mantis held over and then in a glass of water as a long dark worm emerges from its abdomen.
• DD-597 Sclerotherapy: Sclerotherapy treats unwanted veins by injecting a solution (a sclerosant) that damages the vein's inner lining, the endothelium. The vein then becomes inflamed, scars and closes, and over weeks to months the body clears it and it fades. It's used for spider veins (telangiectasias), small reticular veins and some varicose veins. For larger varicose veins, the sclerosant is often whipped into a foam and injected under ultrasound guidance, a technique NICE has assessed in its guidance. The sclerosants in widest use are detergents such as polidocanol and sodium tetradecyl sulfate, which break down the cell membranes of the lining. Hypertonic saline, a concentrated salt solution, works by drawing water out of the cells. It's one option, but not the usual one, and ordinary saline wouldn't close a vein. Several sessions may be needed. Clinical sources list common effects such as pain at the injection site, bruising, temporary lumps, brown staining of the skin and new tiny red veins ('matting'). They list rare complications including skin ulcers, allergic reactions, and clots in deeper veins. This case is general information, not medical advice. The footage shows a needle injecting into small purple veins on a leg.
• DD-598 Blood Destruction II: Many snake venoms, especially those of vipers (the family that includes rattlesnakes), are haemotoxic: they act on blood and blood vessels. A 2017 review in the British Journal of Haematology by Slagboom and colleagues describes three main routes. First, snake venom metalloproteinases (SVMPs) digest the basement membrane that supports capillary walls, especially type IV collagen. A 2016 review by Gutiérrez and colleagues explains that the weakened capillaries are then torn apart by the normal pressure of blood flow, so blood leaks into the tissue. Second, procoagulant toxins activate clotting factors such as Factor X and prothrombin, or act directly on fibrinogen. Inside the body this burns through the clotting factors, a condition called venom-induced consumption coagulopathy (VICC), and the blood ends up unable to clot. That's why a bite can cause both clotting and bleeding. Third, toxins such as disintegrins and C-type lectins can block platelets from clumping, or activate them until they're used up. Slagboom and colleagues cite about 1.8 million snake envenomings and up to 125,000 deaths a year. The same toxins are studied as drugs and diagnostic tools. The footage shows venom being collected from a snake held over a covered jar, then drawn into a syringe and added to blood in a glass, where the blood quickly thickens into a clot, a lab-glass illustration of the procoagulant effect. The snake isn't identified.
• DD-599 Albatross Chicks: The grey-headed albatross (Thalassarche chrysostoma) is a mollymawk that breeds on islands in the Southern Ocean, with about half the world population on South Georgia. The IUCN lists it as Endangered. According to the Agreement on the Conservation of Albatrosses and Petrels (ACAP), it usually breeds every other year. Eggs are laid in October, incubation averages 72 to 74 days, chicks hatch mostly in December, and they fledge in late April or May at about 116 to 145 days old. The single egg goes in a large mud-and-grass nest, typically on steep slopes or cliffs with tussock grass. At Bird Island, South Georgia, a British Antarctic Survey team used electronic weighing platforms under the nests to log chick mass every 10 minutes, nearly a million weighings in all. They found grey-headed parents delivered meals averaging 616 g, and with both parents foraging the chick got a meal about every 1.26 days. The diet is mostly squid, with some fish and crustaceans. Like other albatross chicks, they reach a peak mass well above adult weight, about 30% or more according to a 2000 study in Ibis, then slim down before fledging. Wikipedia, citing Bird Island studies, gives a peak of about 4.9 kg; adults average about 3.65 kg. The footage shows a grey downy chick on a pedestal nest above the sea, then a whiter, fluffier chick in tall tussock grass, illustrating albatross chicks at different stages or sites.
• DD-600 Kawah Ijen: Kawah Ijen is the crater of the Ijen volcano in East Java, Indonesia. It holds a turquoise lake rich in sulfuric and hydrochloric acid. Its famous 'blue fire' (locally api biru) isn't lava. Photographer Olivier Grunewald, who documented it for years, told National Geographic and Smithsonian that the glow comes from burning sulfur-rich gases. These leave cracks at high pressure and temperatures up to 600 °C and ignite in air above about 360 °C, with flames up to about 5 m high. Some of the gas condenses into liquid sulfur that keeps burning as it runs downhill, which looks like flowing blue lava. The flames are faint, so they show only at night. USGS geologist John Pallister told National Geographic that miners sometimes light the sulfur themselves, which adds to the flames in night photos. Ijen is also a working sulfur mine. Ceramic pipes channel gas from a vent by the lake, and it condenses into molten sulfur that hardens yellow. Miners break off chunks and carry them out in baskets. Wikipedia, citing several reports, puts typical loads at 75 to 90 kg, carried up about 300 m to the crater rim and then about 3 km down, often twice a day. A 2024 study measured sulfur dioxide along the miners' path at 3.14 to 18.24 mg/m³, above the US EPA's 1.97 mg/m³ guideline. Miners reported eye irritation, coughing, headaches and shortness of breath. The footage shows bright blue flames and burning streams against the dark night slopes.
• DD-601 Octopus Robo-Grip: In February 2020, researchers from Beihang University, Harvard's Wyss Institute and Harvard SEAS, and the automation company Festo published a study in Soft Robotics on octopus arm-inspired tapered soft actuators with suckers. Zhexin Xie and August Domel were co-first authors, and Katia Bertoldi and Li Wen were co-senior authors. The team measured how much octopus arms taper and found that a cone-shaped silicone actuator bends into a wider range of curvatures than a cylindrical one. A steeper taper curls less tightly but pushes with more force. The researchers added suction cups modeled on those of the common octopus (Octopus vulgaris), shrinking from base to tip, and all linked to a single vacuum line. The arm runs on two valves: one pressurizes it to bend, and one applies vacuum to the suckers. Harvard's press release says it gripped thin plastic sheets, mugs, test tubes, eggs, smartphones, exercise balls and even live crabs, and could reach into narrow openings. Xie is also co-inventor of the Festo Tentacle Gripper, a commercial prototype of the idea. In 2023, a Beihang-led team with Li Wen and Cecilia Laschi reported a sensorized soft octopus arm (E-SOAM) in Science Robotics that bends and elongates to reach and grasp. The footage shows a robot arm whose multi-tentacle gripper curls around a ball, a box, a hat and a plant, a demonstration of the same tapered, suction-cup design.
• DD-602 Sheep Dipping: Sheep scab is an intensely itchy skin disease caused by the mite Psoroptes ovis. The UK's National Animal Disease Information Service (NADIS) says the mites' droppings trigger an allergic reaction that leads to rubbing, wool loss, scabs and rapid weight loss. In severe cases it can kill. NADIS says compulsory treatment was enforced in Britain from 1928. Eradication failed and control was deregulated in 1992, but England and Wales still legally require infected flocks to be treated, and Scotland made the disease notifiable again in 2010. According to the UK sheep-parasite group SCOPS, there are now only two treatments for scab in the UK: plunge dips containing the organophosphate diazinon, and injectable macrocyclic lactones. Organophosphate dips work only as a proper plunge dip, never through jetters or showers. NADIS says dips kill scab mites within 24 hours, keep working for several weeks, and also control blowfly, lice, keds and ticks. Synthetic pyrethroid (cypermethrin) dips were once the other option. NFU Scotland reported in 2010 that the Veterinary Medicines Directorate suspended them in 2006 over water pollution and manufacturers then stopped making them. Organophosphates are highly toxic to people too. The UK Health and Safety Executive requires anyone buying OP dip to hold a certificate of competence and sets rules for protective clothing, storage and disposal. NFU Scotland notes that concerns have been raised about effects on human health. The footage shows sheep being pushed through a dip, with a metal tipping cradle and frame over the swim bath. The country isn't identified.
• DD-603 Mars Nights: NASA describes Mars's atmosphere as thin and made up mostly of carbon dioxide, with nitrogen and argon. Astronomy magazine puts it at about 1% of Earth's and notes that with so little air, the stars barely twinkle, and with no light pollution the nights are very dark. Dust is the catch. Rover observations show that even straight overhead, suspended dust dims stars by about one magnitude, and by up to four magnitudes near the horizon. When the sky is clear, NASA's Opportunity rover could just pick out magnitude 6 stars, about the limit of the human eye. Dust also makes Martian twilight last much longer. The constellations look the same as from Earth. BBC Sky at Night Magazine explains that Mars is so close to Earth, compared with the distance to the stars, that there's no visible parallax shift: Orion and Cassiopeia keep their shapes. What does change is the sky's pivot. Mars's axis points between Deneb in Cygnus and Alderamin in Cepheus, near only a faint star, so Mars has no bright North Star like Polaris. Earth appears as a bright morning or evening 'star', with the Moon beside it. On January 31, 2014, NASA's Curiosity rover photographed exactly that, about 80 minutes after sunset. Mars's two moons are visible too: Phobos rises in the west, crosses the sky in about four hours and visibly changes phase along the way, while Deimos looks like a very bright star. The footage shows a dense Milky Way-style star field above dark red ground, an artistic composite rather than a rover photograph.
• DD-604 Northrop Grumman: Northrop Grumman is a US aerospace and defense company based in Falls Church, Virginia. Its 2025 annual report (Form 10-K) says the company began in 1939 in Hawthorne, California, as Northrop Aircraft Incorporated, founded by Jack Northrop. Northrop Corporation was a principal developer of flying-wing designs, which, according to the company's heritage page, led to the B-2 stealth bomber. In 1994 it acquired the Grumman Corporation, which built the Apollo Lunar Module, and the combined company was renamed Northrop Grumman. The heritage page lists more than 20 companies it has since absorbed, including Westinghouse's defense electronics business (1996), Litton (2001), TRW (2002), Scaled Composites (2007) and Orbital ATK (2018). The 10-K reports 2025 sales of $41.954 billion, about 84% of them to the US government, and about 95,000 employees. It lists the B-21 Raider long-range strike bomber for the US Air Force and support for the B-2 Spirit among its key programs. For NASA's James Webb Space Telescope, launched on December 25, 2021, Northrop Grumman was the prime contractor. It designed and built the deployable sunshield, provided the spacecraft and integrated the whole observatory. NASA describes the sunshield as five layers of Kapton coated with reflective metal, each thinner than a human hair, about the size of a tennis court. The Reel uses company footage, including a hangar with aircraft, a holographic globe, an underwater drone, a cleanroom and a satellite.
• DD-605 Kailasa Temple: The Kailasa temple is Cave 16 of the Ellora Caves in Maharashtra, India, a UNESCO World Heritage Site since 1983. UNESCO calls it the largest monolithic temple of the 34 caves, which were cut into a basalt cliff between about AD 600 and 1000. The Archaeological Survey of India (ASI) calls it the largest single monolithic excavation and attributes it to the Rashtrakuta king Krishna I (c. 757–783), citing a copper-plate inscription of c. 812–813. The temple is dedicated to Shiva and named after Mount Kailash, which Hindu tradition holds to be Shiva's home. Rather than being built up from blocks, it was cut downward from the top of a sloping rock face into a free-standing shrine, with a gateway, a Nandi pavilion and a surrounding courtyard. Wikipedia, citing published estimates, puts the stone removed at about 85,000 m³, weighing about 200,000 tonnes, and the courtyard at about 82 by 46 m. Those figures are modern estimates, not records. The court elephants and an elephant-and-lion frieze around the base are among the parts the historian M. K. Dhavalikar attributes to Krishna I. Other parts, including the sculpture of Ravana shaking Mount Kailasa, appear to be later additions. The footage is aerial and close-up drone video of the temple and its carved walls.
• DD-606 The Iron Dome: Iron Dome is a mobile short-range air defense system built by Israel's Rafael Advanced Defense Systems with Israel Aerospace Industries. According to Wikipedia, it is designed to intercept rockets and artillery shells fired from about 4 to 70 km away. A battery has three parts. The EL/M-2084 radar, built by Elta, detects a launch and tracks its path. A battle-management center, built by mPrest, predicts where the rocket will land and fires only at those headed for populated or protected areas. Three or four launchers each hold 20 Tamir interceptors, which carry electro-optic sensors and steering fins. Rafael says the Tamir has a special warhead that detonates the target's warhead in the air. In a 2015 drone test, some targets were destroyed by the proximity warhead and others by a direct hit. Iron Dome was declared operational near Beersheba on March 27, 2011, and made its first interception on April 7, 2011. The United States contributed $1.6 billion from 2011 to 2021 and approved another $1 billion in 2022. Success rates are disputed. Rafael says more than 90%. Israeli military figures reviewed by Michael Armstrong (2018) were about 85% in 2012 and about 90% in 2014. Those rates count only rockets the system chose to engage. Critics, including MIT's Theodore Postol and Richard Lloyd, argued from video and damage analysis that far fewer warheads were destroyed. Armstrong reports that proponents dispute those methods. Rafael has also offered a naval version, C-Dome, unveiled in 2014.
• DD-607 Mount Kailash: Mount Kailash is a 6,638 m (21,778 ft) peak in the Gangdise (Kailash) Range of the Transhimalaya, in Ngari Prefecture in western Tibet, China. It is sacred in four religions. Hindus regard it as the home of Shiva. Buddhist texts describe it as the mythological Mount Meru. According to Jain scriptures, Rishabhadeva, the first Tirthankara, attained liberation there. It is also sacred in Bon, Tibet's pre-Buddhist tradition. There is no recorded ascent. The Chinese government prohibits climbing it because of its religious significance. A Spanish expedition was refused permission in 2001, and the mountaineer Reinhold Messner turned down an offer from the Chinese government in the mid-1980s. Instead, pilgrims walk a circuit (kora or parikrama) around the mountain, about 52–53 km long and with its highest point at the Drölma pass, about 5,650 m. Hindus and Buddhists walk it clockwise and Bon followers counterclockwise. Sources disagree about Jains: Wikipedia says they walk clockwise, while Britannica says they go counterclockwise. The sources of four rivers lie nearby: the Indus, Sutlej, Brahmaputra and Ghaghara (Karnali). Britannica notes that pilgrimage access reopened in 1981, that Indian pilgrimages paused for about five years from 2020 and that they resumed in June 2025. The footage shows aerial views of the snow-capped peak.
• DD-608 Floatovoltaics: Floating solar, also called floating photovoltaics (FPV) or floatovoltaics, puts solar panels on pontoons or purpose-built floats on reservoirs, lakes, ponds and other calm water. According to the World Bank's 2019 market report, the first FPV system was built in 2007 in Aichi, Japan. The first commercial installation was a 175 kWp array on a winery's irrigation pond in Napa Valley, California, in 2008. The report says the platform is held in place by anchoring and mooring to the bank, to the bottom, to piles, or a combination. Besides saving land, the report lists possible benefits: reduced evaporation from reservoirs, better energy yield because water cools the panels and there's less dust, and the option of using existing power lines at hydropower dams. It also notes that the size of these performance gains has yet to be confirmed by larger installations across multiple regions and over time. Wikipedia reports installed capacity grew from about 3 GW in 2020 to 13 GW in 2022. It cites a World Bank estimate of 6,600 large bodies of water suitable for floating solar, with more than 4,000 GW of technical capacity if 10% of their surface were covered. Some footage shows panels on fixed posts over shallow water, a closely related approach that is included as illustration.
• DD-609 Lunar Roving: The Lunar Roving Vehicle (LRV) was the electric car of the last three Apollo missions. According to NASA, it made its debut on July 31, 1971, when Apollo 15's David Scott and James Irwin drove it. Rovers were also driven on Apollo 16 (John Young and Charles Duke) and Apollo 17 (Gene Cernan and Harrison Schmitt), each used for three traverses, one per day. NASA's Space Science Data Coordinated Archive gives its mass as 210 kg and its design payload as 490 kg (Wikipedia gives 440 kg), so it could indeed carry more than twice its own mass. The frame folded so it could ride to the Moon in a bay of the Lunar Module. Each of its four wire-mesh wheels had its own 0.25-horsepower electric motor, powered by two 36-volt silver-zinc batteries that were not rechargeable. Boeing built the rovers, with Delco as a major subcontractor. The original $19 million contract ended up costing $38 million for four rovers, one of which was used for spare parts. Apollo 15's rover was driven 27.8 km, and Apollo 17's went 35.9 km, with a farthest distance of 7.6 km from the lander. The three rovers are still on the Moon. The footage is a view from the rover's TV camera, wrapped in gold-colored thermal insulation, looking across the lunar surface.
• DD-610 Laser Ignition: Light can set off a gas mixture in several ways. A 2013 review in Optics Express by Geoff Dearden and Tom Shenton lists four mechanisms. In thermal initiation, the laser heats the gas or a surface. In non-resonant breakdown, a tightly focused pulse ionizes the gas into a tiny plasma spark. Resonant breakdown is a variant that relies on the gas absorbing specific wavelengths. In photochemical ignition, single photons split molecules, which usually requires ultraviolet light. Chlorine is a classic example of the photochemical route. Harvard's lecture-demonstration notes give the Cl–Cl bond energy as 243 kJ/mol, matching a photon of about 2.51 eV, or 492 nm. Photons at 405–450 nm carry about 2.8–3.1 eV, so they are energetic enough. Once a photon splits a chlorine molecule, a chain reaction (Cl + H₂ → HCl + H; H + Cl₂ → HCl + Cl) can turn explosive in a hydrogen–chlorine mixture. Energy alone isn't enough, though. Harvard's demo uses colored LEDs and only the UV one sets off the tube, and oxygen inhibits that chain. Engine laser ignition, reviewed by Dearden and Shenton and by Morsy (2012), works differently. Engine tests have typically used nanosecond pulses from near-infrared Nd:YAG lasers (1064 nm) focused into a plasma spark. They've been studied as a replacement for spark plugs in high-compression engines, and Wikipedia notes proposed uses in rocket engines. The footage shows a blue laser triggering a fireball and black soot in a flask, then liquids poured to make a yellow-green gas that appears to contain chlorine. A solid is added, and the laser fires again.
• DD-611 Golden Drop: The golden eagle (Aquila chrysaetos) is the most widely distributed eagle, found across the Northern Hemisphere. It mainly eats hares, rabbits, marmots and ground squirrels, and occasionally takes larger prey such as ungulates. Its best-documented dropping behavior involves tortoises. A 2022 study in Scientific Reports by José María Gil-Sánchez and colleagues describes golden eagles in southeastern Spain preying on spur-thighed tortoises (Testudo graeca) by dropping them onto rocks to break their shells. The tortoises served as alternative prey where rabbits had become scarce, and the eagles selected adult females. A 2022 study in Diversity by Lavrentis Sidiropoulos and colleagues found that tortoises made up an average of 71% of prey categories in golden eagles' breeding-season diet in northern Greece. Outside the breeding season, while tortoises hibernate, the eagles switched to carrion, mammals and birds. Golden eagles also drop sticks and rocks in courtship, catching them again in mid-air. The Reel's footage shows an eagle carrying a young ungulate, which then tumbles down rocky slopes. Dropping or knocking ungulates off cliffs is known mainly from filmed and anecdotal reports rather than systematic studies.
• DD-612 Supercell: A supercell is a thunderstorm with a deep, persistent rotating updraft called a mesocyclone. The National Weather Service (NWS) office in Amarillo says supercells are the least common type of thunderstorm but are especially prone to severe weather, including damaging winds, very large hail and sometimes tornadoes. NOAA's JetStream adds that they cause nearly all significant US tornadoes and most hailstones larger than a golf ball, and that their updrafts can exceed 100 mph (160 km/h). The key ingredient is vertical wind shear, a change in wind speed and direction with height. NWS Amarillo calls moderate to strong shear between the surface and about 20,000 ft the most critical factor. Shear creates horizontal spin, and a strong updraft tilts it upright and stretches it into a rotating column. Shear also tilts the storm, keeping its updraft and downdraft apart so rain-cooled air doesn't choke it off. That's why a supercell can last for hours. Wikipedia gives a typical life of 2–4 hours, sometimes more than 7. Fewer than about 30% produce tornadoes. In a 2017 study, Johannes Dahl showed that simple tilting of the environment's horizontal spin doesn't fully explain the rotation near the ground. Supercells are often classified as classic, low-precipitation and high-precipitation. The footage shows a time-lapse of a towering storm cloud over farm fields.
• DD-613 Sickled Cells: Sickle cell disease is a group of inherited red blood cell disorders caused by a mutation in the beta-globin gene, which helps make hemoglobin. According to the US National Heart, Lung, and Blood Institute (NHLBI), normal red blood cells are disc-shaped and flexible, so they move easily through large and small vessels. The mutation swaps a single amino acid, valine for glutamic acid, producing hemoglobin S. When hemoglobin S gives up its oxygen in the tissues, it links into long, rigid strands inside the cell. A 2019 review in the Annual Review of Pathology by Prithu Sundd and colleagues describes how these polymers stiffen and distort the cell. The sickled cells are inflexible and can stick to vessel walls, slowing or blocking blood flow. That starves nearby tissue of oxygen and can cause sudden episodes of severe pain, called pain crises. NHLBI also notes that sickle cells break apart early, lasting only 10 to 20 days compared with 90 to 120 for normal red cells. The body may not keep up, which leads to anemia. Other complications NHLBI lists include acute chest syndrome, stroke, eye problems and infections. The disease is autosomal recessive: a person must inherit the mutation from both parents. The FDA says it affects about 100,000 people in the US. Chicago physician James B. Herrick first described it in the medical literature in 1910. On December 8, 2023, the FDA approved the first cell-based gene therapies for it, Casgevy and Lyfgenia, for patients 12 and older. The footage is a medical animation of red cells flowing through a vessel, then sickled cells clumping.
• DD-614 NVIDIA's Blue: Blue is a small, Star Wars-inspired robot from Disney Research, part of the company's BDX droid family. It joined NVIDIA CEO Jensen Huang onstage during his GTC 2025 keynote in San Jose on March 18, 2025. TechRadar quotes Huang as saying, "Blue has two Nvidia computers inside." Disney Research's Moritz Bächer told TechRadar that each BDX droid has four actuators in the head and neck, five in each leg, and two NVIDIA Jetson computers. The droids learn to move in character through reinforcement learning in simulation. At the same keynote, NVIDIA announced Newton, an open-source physics engine for robotics built on its Warp GPU framework and OpenUSD. NVIDIA's announcement describes Newton as co-developed with Google DeepMind and Disney Research, and says Disney Research would be the first to use it for its robotic characters. Newton was not yet available at GTC. On September 29, 2025, the three organizations contributed it to the Linux Foundation, and it was released in beta under open governance. Disney had already shown BDX droids at GTC 2024. The Reel's footage shows the droid walking on a dark stage in front of a desert backdrop.
• DD-615 On A Glide: The Space Shuttle orbiter came home without engine power. NASA's Glenn Research Center explains that once the external tank was gone, the main engines had no propellant, so the shuttle returned as an unpowered glider. It had a low lift-to-drag ratio because it had to slow from about 17,300 mph to about 250 mph. About an hour before landing, a deorbit burn dropped it out of orbit. It entered the atmosphere nose-first at a 40° angle of attack to limit heating, and computers controlled its speed with a series of banking roll reversals. NASA's Kennedy Space Center fact sheet says commanders took manual control for the final approach during subsonic flight, usually about 22 miles (35 km) from touchdown. The initial approach glide slope was 20 degrees, more than six times steeper than an airliner's 3 degrees. Because the orbiter was unpowered, it had no go-around capability. It touched down at 213 to 226 mph. From 1991, orbiters were fitted with a 40-foot drag parachute, deployed as the nose came down, plus carbon brakes. Of 133 successful landings, 78 were at Kennedy's 15,000-foot Shuttle Landing Facility, 54 at Edwards Air Force Base in California and one, STS-3, at White Sands in New Mexico. The program flew 135 missions between April 12, 1981, and July 21, 2011, when Atlantis made the final landing. The footage shows an orbiter gliding over Florida wetlands, touching down and rolling out with its drag chute.
• DD-616 Shape Memory: Shape-memory alloys can be bent out of shape when cool and then spring back when warmed. The best known is nitinol, an alloy of roughly equal parts nickel and titanium. Its name comes from Nickel, Titanium and the Naval Ordnance Laboratory, where William J. Buehler's team discovered it in 1959. According to ASME, the team was looking for materials for tools to dismantle mines. Wikipedia recounts that, at a 1961 meeting, someone heated a folded strip of it with a pipe lighter and it snapped back to its original shape. The effect comes from a reversible change in crystal structure. Below its transformation temperature, nitinol is in a monoclinic martensite phase that deforms easily and holds its new shape. Heated above that temperature, it converts to a cubic austenite phase and returns to its original form. The remembered shape isn't automatic. ASME says the part must be shape-set by clamping it in a mold, heat-treating it at about 500 °C and cooling it quickly. Composition and heat treatment adjust the transformation temperature. Above that temperature, nitinol is also superelastic, recovering from strains of about 8%. The shape-memory effect was first seen in a gold–cadmium alloy in 1932 by the Swedish chemist Arne Ölander. Shape-memory polymers became commercially available in the late 1990s. Nitinol is now used in stents, orthodontic wires and eyeglass frames. The footage shows a bent wire and a coil over a red heating element, straightening and contracting as they warm.
• DD-617 Mercedes Stadium: Mercedes-Benz Stadium in Atlanta opened on August 26, 2017, replacing the Georgia Dome as home of the NFL's Atlanta Falcons and MLS's Atlanta United FC. It is owned by the state of Georgia through the Georgia World Congress Center Authority and operated by the Falcons' parent company, AMB Group. Its construction cost was estimated at $1.6 billion in 2016. The architects, HOK, designed it from the top down. The roof has eight translucent ETFE "petals", each about 220 feet long. They appear to rotate like a camera aperture but actually slide in unison along 16 straight tracks, and HOK says they open in eight minutes and close in seven. Its circular opening was inspired by the oculus of Rome's Pantheon. The roof wasn't finished when the stadium opened. At a July 2018 demonstration, about 11 months after the first event, it opened in 8 minutes 10 seconds, according to the Atlanta Journal-Constitution. Below it hangs the Halo, a ring-shaped video board 58 feet tall and 1,100 feet around. The master plan set a regular capacity of 71,000, expandable to 75,000 for events such as the Super Bowl. On November 15, 2017, it became the first professional sports stadium to earn LEED Platinum certification, with 88 points. The stadium credits that to 4,000 solar panels producing about 1.6 million kWh a year, a 680,000-gallon rainwater cistern and a 2.1-million-gallon stormwater system. It hosted Super Bowl LIII in 2019. The footage looks up through the open roof from the field, then pans around the seating bowl and the Halo board.
• DD-618 Casimir's Effect: In 1948 the Dutch physicist Hendrik Casimir predicted that two uncharged, parallel conducting plates in a vacuum would be pushed together. In quantum theory, the vacuum is not empty but full of fluctuating electromagnetic fields. The plates limit which field modes fit between them, so the pressure outside is greater than the pressure inside. The force is tiny and only matters at very small separations. Steven Lamoreaux measured it directly in 1997, at gaps of 0.6 to 6 micrometers, agreeing with theory to within about 5%. Engineers now consider it in the design of micromachines (MEMS). The dynamic version, which is what the Reel describes, was proposed by Gerald Moore in 1970. A mirror moving at a significant fraction of the speed of light could convert virtual photons into real, detectable ones. Moving a physical mirror that fast isn't practical. In 2011, Christopher Wilson and colleagues at Chalmers University of Technology in Sweden instead used a superconducting circuit, published in Nature. A SQUID (superconducting quantum interference device) changed the electrical length of a transmission line about 11 billion times a second, at an effective speed of a few percent of light speed. They detected microwave photons emitted in correlated pairs, the predicted signature, and called it the first observation of the dynamical Casimir effect. The footage shows two metal strips hanging side by side and drawing together. That's a visible-scale stand-in for illustration: real Casimir forces are only measurable at micrometer gaps.
• DD-619 The Glades: The Everglades is a region of flooded grasslands in southern Florida. It forms the southern half of the Kissimmee–Okeechobee–Everglades watershed, which begins near Orlando with the Kissimmee River. That river drains into shallow Lake Okeechobee. In the wet season, water spilling south from the lake spreads into a sheet about 60 miles wide and over 100 miles long. It moves about half a mile a day across a limestone shelf toward Florida Bay, and can take months or years to get there. Marjory Stoneman Douglas called it a "river of grass" in her 1947 book. Wikipedia notes the phrase captures only part of the system. Its main feature is sawgrass marsh, broken up by deeper sloughs, tree islands, cypress domes, and mangroves and coastal prairie where it meets the sea. The National Park Service calls the American alligator (Alligator mississippiensis) a keystone species of the Everglades. In the winter dry season, alligators dig "alligator holes" that hold water when the surrounding marsh dries out, becoming refuges for fish, turtles and wading birds. About half of the original Everglades has been converted to farms and cities. Canals and levees were built from the late 1800s, including 1,400 miles under a 1948 federal flood-control project. Congress approved the Comprehensive Everglades Restoration Plan in 2000. Everglades National Park was dedicated by President Truman on December 6, 1947. The footage shows open sawgrass water under a blue sky, then close-ups of marsh plants, an alligator and cypress trunks.
• DD-620 Ardabil: Ardabil is the capital of Ardabil province in northwestern Iran, near the border with Azerbaijan, with about 588,000 people in the 2022 census. It lies on an open plain just east of Mount Sabalan, a 4,811-meter dormant stratovolcano. Wikipedia lists the city's elevation as about 1,350 meters, with an average altitude of 1,263 meters. Local historical research puts its origins 4,000 to 6,000 years back, and Muslim historians credit its founding as a city to the Sasanian king Peroz I in the fifth century. Ardabil's fame comes from Sheikh Safi al-Din Ardabili, a Sufi master who died in 1334. His followers, the Safaviyya order, stayed loyal to his family. In 1501 a descendant, Ismail I, seized power, united Iran and made Shi'a Islam the state religion; the Safavid dynasty took its name from Sheikh Safi. Ismail I is buried at the shrine too. The Safavids promoted the shrine as a pilgrimage site, and in the late 1530s Shah Tahmasp enlarged it and commissioned the famous pair of Ardabil carpets, one now at London's V&A and the other at the Los Angeles County Museum of Art. UNESCO inscribed the Sheikh Safi al-Din Khānegāh and Shrine Ensemble as a World Heritage Site in 2010. Its route to the shrine has seven segments, mirroring the seven stages of Sufi mysticism. The footage shows the shrine's tiled tower, facades and dome interiors.
• DD-621 Raytheon: Raytheon is one of RTX Corporation's three business segments, alongside Collins Aerospace and Pratt & Whitney. The company began in 1922 in Cambridge, Massachusetts, as the American Appliance Company, founded by Laurence K. Marshall, Vannevar Bush and Charles G. Smith. Its first hit product was a gas-filled rectifier tube, named Raytheon ('light from the gods'), that let radios run on household current instead of batteries. The company took the tube's name and grew through radar and microwave work, including the first microwave ovens. In April 2020, Raytheon Company merged with United Technologies to form Raytheon Technologies, which renamed itself RTX in 2023. Today the Raytheon segment makes air and missile defense systems such as Patriot, the AN/SPY-6 family of naval radars, missiles and sensors. RTX reported Raytheon's 2024 net sales at $26.7 billion, with growth from Patriot, NASAMS and counter-drone programs. Raytheon's own site lists more than 52,000 employees, and in 2024 it sold its cybersecurity, intelligence and services business. RTX as a whole has a backlog of about $218 billion. The footage is corporate promotional video: control rooms, a missile launch, lab work and a Raytheon sign.
• DD-622 Fresh Fiat: US paper money is made by the Bureau of Engraving and Printing, part of the Treasury Department, which has printed the nation's currency since 1862. All of it comes from two plants, in Washington, D.C., and Fort Worth, Texas. Coins are a separate job, made by the US Mint. The notes are Federal Reserve notes, and the Federal Reserve Board, as their issuing authority, sends the BEP an annual print order. The 2025 order, approved on July 16, 2024, called for 4.1 billion to 5.9 billion notes worth $83.2 billion to $113 billion. The Board says the main driver in recent years has been replacing unfit notes destroyed in normal processing, along with demand at home and abroad. The BEP reported finishing the 2025 order at 4.8 billion notes. The 2026 order ranges from 3.8 billion to 5.1 billion notes, and a redesigned $10, the first of the 'Catalyst' series, is due in 2026. The dollar is 'fiat' money because its value rests on law and trust rather than a promise to swap it for gold. The last link, letting foreign governments convert dollars to gold, ended on August 15, 1971, when President Nixon suspended convertibility. The footage shows a currency plant: sheets on presses, stacks of printed notes and bundles moving along conveyors.
• DD-623 Cloud Chambers: A cloud chamber makes the paths of electrically charged particles visible. Inside, the air holds more vapor than it normally could, so it is supersaturated and ready to condense. A fast charged particle knocks electrons off molecules along its path and leaves a line of ions behind it. Vapor condenses on those ions as tiny droplets, which form a thin trail. The trail doesn't glow: it shows up because a lamp lights it against a dark background, and it fades within moments. The Scottish physicist C.T.R. Wilson built the first cloud chamber at Cambridge's Cavendish Laboratory in 1911. His version used water vapor and made it supersaturated with a sudden expansion. He shared the 1927 Nobel Prize in Physics for the method. Many classroom chambers today are diffusion chambers, which keep alcohol vapor supersaturated over a very cold plate, so tracks form continuously. The shape of a track hints at the particle: alpha particles leave short, thick tracks and electrons leave thin, wandering ones. In a magnetic field, the tracks curve, which reveals charge and momentum. That is how Carl Anderson identified the positron, the first known antiparticle, in 1932.
• DD-624 Tigers & Trees: Tigers (Panthera tigris) rear up against tree trunks and rake the bark with their front claws. Old accounts describe scratch marks more than 3 m (about 11 ft) up a trunk, and one soft-barked tree in an Indian zoo was scratched so often that it died. Scratching helps keep the claws in shape: observers watching a captive tigress found a shed outer layer of claw left in a scratch mark. The gouges are also thought to work as signals to other tigers. Tigers have scent glands between their toes, but tiger-pheromone researchers say little is known about what those secretions communicate. A tiger's best-documented scent mark is marking fluid sprayed onto trees and bushes. Studies of wild tigers in Nepal's Chitwan, along with captive work in India, suggest this spray carries information about territory and breeding. Tigers also leave scrapes on the ground and droppings as marks. Researchers think marking helps tigers keep track of one another and avoid unwanted encounters. The footage shows a tiger scratching a pine trunk in snow.
• DD-625 Pipeline Blasting: On pipeline projects, blasting is mostly used to break up bedrock so crews can dig the trench for new pipe. The footage shows that kind of blast: a line of charges lifting mud and rock along a slope. Crews try machines first, such as bulldozer-mounted rippers and rock hammers. Pipeline blasting plans filed with U.S. regulators call for explosives only where rock can't be dug economically any other way. The work is tightly controlled. A contractor has to write a site-specific blasting plan and follow state and local explosives rules. Typical plans call for surveys of buildings, wells and utilities within 150 ft before blasting, plus vibration and air-blast monitoring and blasting mats to hold down flying rock. They also require warning signals and inspections afterward. Charges are loaded into drilled holes and fired in sequence a few milliseconds apart, which keeps ground shaking down. FERC also requires a schedule of planned trenching or blasting for each waterbody wider than 10 ft. The Reel says blasting is used to remove old pipelines, but none of the sources I found support that as a normal method.
• DD-626 Chip Change: Replacing a chip on a circuit board is called rework, and the industry's guide to it is the IPC-7711/7721 standard. With a surface-mount chip, every joint has to melt at the same time, or the part can't come off cleanly. A hot-air rework station does this by blowing controlled hot air through a nozzle sized to the part. Many setups also warm the whole board from below with a preheater. Flux goes on first to help the solder flow. Once all the joints are molten, the chip is lifted with tweezers or a vacuum pickup. The bare pads are then cleaned with fresh flux and solder wick, braided copper that soaks up old solder. Too much heat or scrubbing can tear a pad off the board. The new part is lined up, tacked in place and reflowed, then checked for bridges (solder shorting two leads), cold joints and lifted pads. Many chips on modern motherboards are ball grid arrays (BGAs). They have no pins: rows of solder balls sit hidden underneath, so they are usually reworked with special equipment, and their joints can't be checked by eye.
• DD-627 Ballistic Trident: The Trident II D5 is a submarine-launched ballistic missile (SLBM) built by Lockheed Martin for the U.S. Navy. It has three solid-propellant stages and inertial guidance. It is 44 ft (13.41 m) long and weighs about 130,000 lb (58,500 kg). The Navy lists its range as 4,000 nautical miles (about 7,360 km), and other sources note that range depends on payload. It can carry several independently targetable reentry vehicles (MIRVs). The missile was first deployed in 1990. Expanding gas pushes it out of the launch tube, and the rocket motors fire once it breaks the surface. Under U.S. Navy listings, each Ohio-class submarine carries 20 D5 missiles and each British Vanguard-class submarine carries 16. The United Kingdom didn't co-develop the missile. It agreed in 1982 to buy Trident II under the Polaris Sales Agreement. According to the UK Parliament, Britain has title to 58 missiles, held in a shared pool with U.S. missiles at Kings Bay, Georgia, while the UK makes its own warheads. A life-extended version (D5LE) joined the fleet in 2017 and is set to arm the next U.S. Columbia-class and UK Dreadnought-class submarines.
• DD-628 insularis blue: The white-lipped island pit viper, Trimeresurus insularis, is a venomous, tree-dwelling pit viper from the Lesser Sunda Islands of Indonesia and Timor-Leste. It is found on more than a dozen islands, from Bali, Lombok and Sumbawa to Flores, Komodo, Sumba, Timor and Wetar, and in eastern Java. It was first described in 1977 as a subspecies of the white-lipped pit viper, T. albolabris, and was raised to a full species in 2001. Most are green. A striking blue form occurs on Komodo and nearby Padar. Field reports describe yellow animals on Flores, and all forms share a red tail tip. The blue snakes are a color morph of the same species, not a separate subspecies. One field account says they lack yellow pigment, which leaves the scales blue. Like all pit vipers, it has a heat-sensing pit on each side of the head, between the eye and the nostril, that helps it find warm-blooded prey in the dark. The IUCN calls it a generalist that is probably the most often seen snake on the islands where it lives. It is also regularly involved in snakebites on Bali. Its color forms are popular in the pet trade and are bred in captivity.
• DD-629 Flying Fishermen III: The osprey (Pandion haliaetus) lives almost entirely on fish, which make up about 99% of its diet. Its outer toe can swing backward, so it can grip with two toes in front and two behind, an arrangement most hawks can't make. Barbed pads on the soles of its feet help hold slippery fish. When it spots a fish, an osprey often drops in stages, hovering in between, then plunges feet-first. Fish are usually caught within about half a meter of the surface. In a 1942 study in Nova Scotia, the final strike was usually judged to come from about 30 to 40 ft up. The bird then rises and shakes the water off. Success rates vary with place, weather and experience. The Cornell Lab of Ornithology says that across several studies ospreys caught fish on at least 1 dive in 4, and sometimes as many as 70%. A 2004 study at Magdalena Bay, Mexico, found 61% success, with an average of 2.4 dives per catch. Wind and choppy water lowered the odds. Once airborne, an osprey turns its fish to face forward, which cuts wind resistance.
• DD-630 HoloFans: 'Holographic fans' are rotating LED displays. Each blade, or 'ray', carries a strip of LEDs. As the rotor spins, a controller switches every LED on and off at exact angles, so each sweep paints the picture one slice at a time, and the eye blends the flashes into a steady image. In a dark room the blur of the blades nearly disappears, so the picture seems to float. Single fans use hundreds of LEDs rather than thousands. HYPERVSN's Solo M has four rays of 168 LEDs each (672 in all) spinning at about 670 rpm, and its newer SmartV Solo M lists 216 LEDs per ray and a 1080 x 1080 picture. Displays only reach thousands of LEDs when several fans are synced into a wall. Despite the name, these aren't holograms. Holography, which Dennis Gabor invented in 1947 and won the 1971 Nobel Prize in Physics for, records and rebuilds light waves using interference. A fan draws a flat image on the plane of its blades, and the 3D look comes from the artwork's shading. This Reel is Part I of a pair. HoloFans II (DD-700) explains the same mechanism, so this case focuses on hardware numbers and the holography history.
• DD-631 Construction Covers: In crowded Chinese cities, some building and excavation sites are now covered by huge air-supported domes, sometimes called 'soft pillows' or 'giant airbags'. Fans on the ground keep pumping air in, so the slightly higher pressure inside holds up a membrane, often PVDF-coated fabric, usually reinforced with steel cables. The main goal is to keep dust and noise from reaching the neighbors. Local officials say a nearly 9,000 m² dome over a renovation site in Guangzhou's Yuexiu District blocks up to 99% of dust. CGTN reported that it keeps construction noise below 60 decibels. A dome in Shenzhen stands 40 m tall over more than 12,000 m². Officials say such domes can be reused and taken down without leaving construction waste. A related design is used on contaminated land. In 2016, a soil-cleanup project at Beijing's former Shougang steelworks built what researchers called China's first negative-pressure membrane yard. There the air pressure is kept slightly lower inside, so fumes and dust can't leak out, and exhaust is filtered before release. The footage shows a white dome between towers and a Gothic-style church, but the Reel doesn't name the site.
• DD-632 Concrete Reefs: Concrete is one of the most widely used artificial-reef materials, both as purpose-built reef modules and as recycled rubble such as old culverts, pipes and bridge pieces. In the U.S., the National Fishing Enhancement Act of 1984 led to a National Artificial Reef Plan, first adopted in 1985 and revised in 2007. It judges reef materials on function, compatibility with the environment, durability and stability. Concrete scores well on durability, but fisheries guidelines say it should be clean and well cured, because fresh concrete is strongly alkaline at first. Hollow cinder blocks, like those dumped from a barge in the footage, are generally considered a poor choice on their own. They are light and break easily, and storms can scatter or bury them. Once sunk, hard surfaces are colonized by algae, sponges, barnacles and, in warm waters, sometimes corals, and fish gather around them. A 2020 meta-analysis of 39 studies found that artificial reefs can support fish communities comparable to natural reefs, but results depend heavily on location and design. Scientists still debate how much artificial reefs produce new fish and how much they simply attract fish from elsewhere, which can make them easier to catch.
• DD-633 Hail Storming: Hail forms inside thunderstorm updrafts. According to NOAA's National Severe Storms Laboratory (NSSL), raindrops are carried up into very cold air and freeze. The young hailstones then grow by colliding with supercooled water drops, liquid colder than freezing, which freeze onto them. A stone grows on a seed of ice, snow or dust. Water that freezes instantly traps air bubbles and makes cloudy ice, while water that freezes slowly makes clear ice. The alternating layers reflect the changing conditions a stone passes through, not just simple up-and-down trips. Hail falls when the updraft can no longer hold up its weight, and stronger updrafts can hold bigger stones. Hail 2 inches (5 cm) or larger usually comes from supercells, storms with a rotating updraft. The largest U.S. hailstone fell in Vivian, South Dakota, on July 23, 2010: 8.0 inches across and about 1.94 lb (0.88 kg). Small hail falls at roughly 9-25 mph, while stones over 4 inches can top 100 mph. 'Hail alley', where Nebraska, Colorado and Wyoming meet, averages seven to nine hail days a year. Insurers count hail as a major part of the tens of billions of dollars in U.S. severe-storm losses each year. The footage shows hail falling past a porch and windows.
• DD-634 Cloud River: Atmospheric rivers are long, narrow corridors of concentrated water vapor in the lower atmosphere that carry moisture thousands of kilometers from the tropics toward higher latitudes. A strong one can move more water than the largest rivers on Earth, and when it meets mountains or cooler air the vapor condenses into heavy rain or snow. The footage, credited to daniel_asam, shows clouds flowing over a ridge.
• DD-635 Connected: The '86 billion neurons' figure comes from a 2009 study by Frederico Azevedo, Suzana Herculano-Houzel and colleagues. They dissolved the brains of four adult men into a uniform 'soup' of cell nuclei and counted samples. They found about 86.1 billion neurons (give or take 8.1 billion), replacing the round 100 billion long quoted in textbooks. Most of those neurons aren't in the wrinkled cortex. About 69 billion are in the cerebellum, and about 16 billion are in the cerebral cortex. Neurons pass signals to each other at synapses. Synapse counts per neuron vary enormously by cell type, so '1,000 to 10,000 per neuron' is only a rough rule of thumb. Whole-brain totals are estimates too. A 2003 stereology study by Bente Pakkenberg and colleagues put the neocortex alone at about 0.15 quadrillion (150 trillion) synapses, which fits within the Reel's range of 100 to 1,000 trillion. No one has counted every synapse in a human brain, so the totals are estimates. The footage is golden, branching animation of neurons.
• DD-636 Doom Plume: Volcanologists call these eruption columns or ash plumes. In an explosive eruption, gas-charged magma shatters into ash, tiny fragments of rock and volcanic glass less than 2 mm across, which shoots out with steam and gases. The jet first rises on its own momentum. It then keeps climbing because it is hotter and lighter than the surrounding air. Heights vary a lot. Iceland's Eyjafjallajökull plume in April-May 2010 mostly reached about 5-10 km, yet its fine ash drifting over Europe led to more than 100,000 cancelled flights. Mount Pinatubo's column in the Philippines on June 15, 1991, rose more than 35 km. The January 15, 2022, eruption of Hunga Tonga-Hunga Ha'apai reached about 57 km, into the mesosphere, the highest volcanic plume recorded in the satellite era. Ash is dangerous to aircraft because it can damage engines, instruments and windscreens, and it can stop jet engines. Health agencies such as the USGS and IVHHN list short-term effects including coughing, sore throats, eye irritation and worsening asthma or bronchitis. People with heart or lung conditions are most at risk. The footage shows a towering orange-lit ash cloud, but the Reel doesn't say which volcano.
• DD-637 Felix Falls: Felix Baumgartner was an Austrian skydiver and BASE jumper. On October 14, 2012, in the Red Bull Stratos project, he rode a pressurized capsule under a helium balloon from Roswell, New Mexico, and stepped off at 38,969.4 m (127,852 ft). Red Bull's final mission data say he went supersonic 34 seconds into the fall and reached 1,357.6 km/h (843.6 mph), Mach 1.25, at 50 seconds. He became the first person to break the speed of sound in freefall without a vehicle. He was in freefall for 4 minutes 20 seconds, and the whole descent from jump to landing took 9 minutes 18 seconds. The FAI, air sports' world governing body, ratified three world records from the jump: exit altitude, maximum vertical speed and freefall distance (36,402.6 m). It now lists the exit-altitude record as superseded, while the speed and freefall-distance records still stand. Baumgartner died on July 17, 2025, aged 56, when he lost control of a motorized paraglider over Porto Sant'Elpidio, Italy, and crashed at a resort. The investigating prosecutor later said the crash was caused by human error and found no technical fault with the equipment. This Reel was posted about four weeks after his death and doesn't mention it.
• DD-638 Tesla Diner: The Tesla Diner opened on July 21, 2025, at 7001 Santa Monica Blvd. in Hollywood, Los Angeles. It's a two-story, 24-hour diner and drive-in built around a Supercharger station, with a 1950s-meets-future design. Tesla says its 80 V4 Supercharger stalls make it the world's largest urban Supercharging station. The stalls are open to any EV that can use Tesla's NACS plug. Two outdoor LED 'megascreens', which Tesla describes as 66 ft, show movies and clips. Drivers can play the sound through their car or the Tesla Diner app, or watch from a rooftop deck. Tesla owners can order from their car's touchscreen. On opening day an Optimus humanoid robot handed out popcorn, and trade press reported it was operated remotely by a person. Tesla says solar canopies shade part of the charging lot. Elon Musk first floated the idea about seven years earlier and said that if it went well, Tesla would open diners in major cities around the world. The Reel's 'all-electric' label isn't how Tesla describes the restaurant itself; the claim checked here is that it's a charging hub with a diner attached.
• DD-639 Earth Movers II: Bagger 293 is a bucket-wheel excavator built by TAKRAF of Leipzig, Germany. It went into service on July 7, 1995, at RWE's Hambach open-pit lignite (brown coal) mine near Cologne. Guinness World Records lists it as the largest and heaviest land vehicle, meaning the biggest machine that moves under its own power. Guinness gives 14,196 tonnes, 220 m long and 94.5 m tall, while other sources give about 14,200 t, 225 m and 96 m. The 21.6 m wheel carries 18 buckets. As it turns, the buckets cut into the mine face and dump onto conveyor belts that carry the earth away. Guinness puts each bucket at 6,600 liters (6.6 m³), but other sources say about 15 m³. It can move 240,000 cubic meters of earth a day. That's a volume, not a weight: at typical soil densities it's well over 200,000 tonnes. It mostly digs overburden, the soil and rock above the coal. It runs on about 16.5 MW of outside electricity through a cable, crawls on 12 caterpillar tracks at a few meters a minute, and needs a crew of five.
• DD-640 UV Curing: UV curing is photopolymerization. A UV-curable ink, coating or adhesive is a liquid mix of small reactive molecules (monomers and oligomers) plus a few percent of photoinitiator. When the photoinitiator absorbs UV light, it breaks apart into reactive species that link the molecules into a solid, crosslinked network, often within a fraction of a second to a few seconds. There are two main chemistries. Free-radical systems, mostly acrylates, form radicals and stop curing almost as soon as the light goes off, and oxygen in the air can slow them at the surface. Cationic systems, mostly epoxies, form a strong acid and can keep curing after the light is gone, which is called 'dark cure'. The light source matters. Traditional mercury-vapor lamps emit a broad spectrum that includes a lot of infrared heat. UV LEDs emit a narrow band, often near 365-395 nm, and produce much less heat, but the formula has to include a photoinitiator that absorbs at that wavelength. Because there's little or no solvent to dry off, UV curing is fast and usually uses less energy than heat drying. The trade-off is that the light has to reach the material, which is why UV-cured pipe liners need translucent glass-fiber tubes (see CIPP).
• DD-641 Bdelloid Rotifers: Bdelloid rotifers (class Bdelloidea) are microscopic animals, usually well under a millimeter long. They live in fresh water and also in damp moss, lichen and soil films that often dry out. In a 2000 paper in Science, they were called the largest animal group in which males, hermaphrodites and meiosis are unknown. Females produce daughters from unfertilized eggs (parthenogenesis). Genetic studies suggest the group may have done without conventional sex for many millions of years, though 'ancient asexuality' is still debated. Bdelloids carry an unusually high share of genes picked up from bacteria, fungi and plants by horizontal gene transfer. A 2015 study estimated about 13 new foreign genes per lineage per million years, with more in species from habitats that often dry out. A 2018 reanalysis, however, found that claims of DNA swaps between bdelloid individuals came from sample contamination. When their habitat dries, bdelloids contract into a 'tun' and enter anhydrobiosis, a dried, dormant state, and revive when water returns. The best-documented dry survival is about 9 years in stored moss. In 2021, researchers revived an Adineta rotifer from Siberian permafrost dated to about 24,000 years old, though it had been frozen rather than dried, and it went on to clone itself in the lab.
• DD-642 Paint Removers: Methylene chloride (dichloromethane) was long the main ingredient in fast-acting paint strippers. It is a small, very volatile molecule that soaks into a paint film, swells and softens it, and loosens it from the surface so it can be scraped off. It's also acutely dangerous. Its vapor builds up quickly in enclosed spaces, and the U.S. Environmental Protection Agency (EPA) has documented dozens of deaths, many of them workers refinishing bathtubs. EPA put the figure at at least 88 people since 1980. EPA banned methylene chloride in consumer paint and coating removers from November 22, 2019. On April 30, 2024, it finalized a ban on all consumer uses and most industrial and commercial uses under the Toxic Substances Control Act, with consumer uses phased out within about a year and most commercial uses within two years. EPA also lists liver harm and several cancers among the risks. Acetone is a different kind of solvent. It evaporates very fast and dissolves some finishes, such as lacquers, many adhesives and nail polish, but it doesn't lift tough cured coatings as well, which is why it's often mixed with other solvents. It's highly flammable. The footage shows stripper being brushed onto painted metal and the paint bubbling off.
• DD-643 Three Gorges: The Three Gorges Dam crosses the Yangtze at Sandouping, near Yichang in Hubei province, China. By installed capacity it's the world's largest power station: 22,500 MW from 32 main 700 MW generators plus two 50 MW units that power the plant itself. The concrete gravity dam is about 2.3 km long, 2,309.5 m along its axis or 2,335 m by another measure. Its maximum height is 181 m, and its crest sits at 185 m above sea level, which is where the Reel's '185 m' comes from. The reservoir normally holds water at 175 m. Construction formally began in December 1994. The dam body was finished in 2006, and Guinness dates the last main generator to July 4, 2012. The whole project wasn't certified complete until 2020, after the ship lift and other works. Output depends on river flow. The design target is 88.2 TWh a year, and in 2020 it set a world record of 111.8 TWh for a single hydropower plant. Besides power, the project is meant for flood control and navigation, through a five-step double ship lock and a ship lift that raises vessels up to 113 m. According to Reuters, about 1.3 million people were relocated to make way for the reservoir.
• DD-644 Aquatic Ambulances: In Venice's historic center and the islands of its lagoon, emergency calls to Italy's 118 number are answered by idroambulanze, water ambulances run by the local emergency medical service SUEM 118. The boats in the footage are yellow, with red-and-yellow checks and the word 'AMBULANZA'. They are fast motorboats with a covered cabin for a stretcher patient and equipment much like a land ambulance: oxygen, a monitor and defibrillator, and stretchers. Italian sources describe the usual crew as a boat pilot, two healthcare workers and a nurse, with an emergency doctor joining for the most serious ('red code') calls. Italy has no separate 'paramedic' profession like the U.S. or UK, so nurses lead the clinical care. Local reporting has put the service at about 18,000 call-outs a year across the lagoon. It has run seven boats, with several on standby at once, based at the city's main hospital, the Ospedale Civile (SS. Giovanni e Paolo). Getting a patient from a narrow canal or a house without a nearby landing usually means carrying them by stretcher through the streets to the boat. A 2023 paper in the European Journal of Emergency Medicine described the service's unusual conditions.
• DD-645 Fissure Flames: A fissure eruption happens when a dike, a vertical sheet of magma forced up through the crust, reaches the surface along a crack. Lava then erupts from many points along a line at once, often as a row of lava fountains that the USGS calls a 'curtain of fire'. Most fissure eruptions involve runny basalt and are effusive, meaning lava pours out rather than exploding. The National Park Service rates them at 0 to 1 on the Volcanic Explosivity Index. So the main products are lava fountains, spatter and gas, not big ash columns. Spatter piling up along the crack builds low ramparts and spatter cones, so a fissure can leave a row of small craters rather than one tall cone. Fissures range from a few hundred meters to tens of kilometers long. Iceland's Laki (Lakagígar) eruption began on June 8, 1783, from a fissure system about 27 km long with more than 130 craters. Feeder dikes for the Columbia River flood basalts reach as much as 180 km. Fissure eruptions are common where plates pull apart, as in Iceland, which sits on the Mid-Atlantic Ridge. They also happen along rift zones on the flanks of hot-spot shield volcanoes like Kīlauea and Mauna Loa, and in volcanic fields in the middle of continents. The footage shows a line of lava fountains beside a gas plume, with a fresh lava field on either side. The source doesn't name the eruption, so the case doesn't either.
• DD-646 Rainbow Mountains: Peru's best-known 'rainbow mountain' is Vinicunca (Winikunka), also called Montaña de Siete Colores ('Mountain of Seven Colors'). It's in the Vilcanota range of the Cusco region, about 100 km southeast of the city of Cusco, between the districts of Pitumarca and Cusipata. Peru's official tourism inventory gives an altitude of 5,036 m, and the top viewpoint is listed at over 5,200 m. The stripes are tilted layers of marine, lake and river sediments laid down roughly 65 to 2 million years ago, then folded and lifted as the Andes rose. Erosion exposed them, and oxidation brought out their colors. The Cusco cultural landscape office, as reported by BBC Mundo, matches each color to its rock. Pink comes from red clay, mudstone and sand. White is quartz sandstone and limestone or marl. Red is iron-bearing claystone. Green is clay rich in iron and magnesium. Mustard yellow is calcareous sandstone rich in sulfur minerals. Brown is magnesium-rich fanglomerate, a rock made of cemented fan gravel. BBC Mundo also mentions copper oxide in the green layers, but neither source mentions copper sulfates. The mountain sits in lands of the Quechua farming communities of Pampachiri and Chillihuani and is regarded locally as a sacred apu (mountain spirit). The footage shows drone views of the striped slopes in mist.
• DD-647 Kazotsky Kick: 'Kazotsky Kick' is the name of a group taunt in Valve's game Team Fortress 2. It was added on July 2, 2015, in the Gun Mettle Update. Any class can perform it, and other players can join in. The official TF2 Wiki calls it a hopak set to a fast folk tune, with variations for each class. The step itself is the prisyadka (also spelled prysiadka), a squat step in which the dancer drops onto the balls of the feet and kicks the legs out one at a time while keeping the back straight. The squat-kick step comes from folk dance of the former Russian Empire and Soviet Union, including the Russian prisyadka and the Ukrainian hopak; the game wiki calls the taunt a hopak. Britannica traces the hopak to the Zaporozhian Cossacks and describes improvised leaps, squatting kicks and turns, and Dictionary.com calls the prisiadka the signature step of the kazachok, a Cossack-style dance. The name 'Kazotsky' isn't a traditional dance name; it's best known from the game. The footage shows men in Soviet-style military uniforms doing squat kicks in what appears to be a colorized archival film. The source doesn't identify the clip, so the case doesn't either.
• DD-648 Hair Barrier: The best-known experiment on this idea didn't use mosquitoes. In 2011, Isabelle Dean and Michael Siva-Jothy at the University of Sheffield published a study in Biology Letters using 29 volunteers, each with one arm shaved and one unshaved. They released bed bugs (Cimex lectularius) onto each arm. On unshaved arms, the bugs took longer to find a place to feed, and volunteers noticed them more often. People with more hair were better at detecting the bugs. The authors suggested that fine body hair may persist partly because it helps people sense parasites. Mosquitoes are different, because they fly in and land rather than crawl across the skin. They find people mainly through exhaled carbon dioxide, body heat and skin odor; a 2022 study in Cell linked 'mosquito magnet' status to higher levels of carboxylic acids on the skin. A 1976 laboratory study of Anopheles gambiae landings on volunteers' forearms found that forearm hair density, along with skin temperature, humidity and color, explained very little of the variation in which person mosquitoes chose. So the idea that hair helps you feel a crawling insect has experimental support, but only for bed bugs. That it makes mosquitoes land less or bite less hasn't been shown. The footage shows a mosquito walking through dense arm hair.
• DD-649 Blood Watch: Intravital microscopy means looking at living tissue inside a living animal, and blood flow was one of the first things it revealed. In 1661, Marcello Malpighi used a microscope on a frog's lung and described capillaries, the tiny vessels linking arteries and veins. In 1839, Rudolph Wagner watched white blood cells roll slowly along vessel walls in a frog's webbed foot. Thin, transparent tissues such as a frog's web, a tadpole's tail or a fish's fin let ordinary bright-field microscopes show red blood cells streaming through capillaries in real time. Plasma, the liquid part of blood, is transparent, so it can't be seen directly. Researchers make it visible by injecting fluorescent tracers, such as FITC-dextran, that stay in the bloodstream and light up the vessels. Modern intravital imaging relies on fluorescence. Labeled antibodies, dyes or genetically encoded fluorescent proteins mark particular cells, and confocal and two-photon microscopes take sharp optical sections. Two-photon microscopy reaches deeper into tissue with less light damage, which is why it's widely used to film immune cells in living mice. In mammals, the small cells that help blood clot are platelets. Fish, amphibians and birds have nucleated thrombocytes instead, and their red blood cells also keep a nucleus. The footage shows transparent tissue with dark pigment cells and branching vessels where blood cells can be seen moving. The source doesn't identify the animal.
• DD-650 Tree Scaling: Climbing a vertical trunk is hard for an animal with no limbs, and biologists have studied how snakes do it in detail. In a 2020 review, Bruce Jayne of the University of Cincinnati described arboreal concertina locomotion. The snake grips a cylinder with alternating left and right bends, and keeps a grip with the uphill part of its body before letting go with the downhill part. It then stretches forward and pulls the rest of its body up. Concertina is reliable, but slow and energetically costly. On rough bark or among twigs and branches, snakes can also use lateral undulation, pushing against bumps and side branches with a wave that passes along the body. This needs something to push against; it doesn't work on smooth surfaces. In 2021, a team including Thomas Seibert, Julie Savidge and Jayne described a new mode in Current Biology called lasso locomotion. Brown tree snakes (Boiga irregularis) on Guam wrapped a single loop around smooth poles too wide for concertina, then inched upward by small bends moving within the loop. The discovery came from efforts to keep the invasive snakes away from nests of endangered birds. The footage shows a snake gripping a pale, smooth trunk at night with tight coils and moving up in stages. The source doesn't identify the species.
• DD-651 Around the Rainbow: A rainbow isn't an object in a fixed place. It's a pattern of light that appears when sunlight enters falling drops, bends (refracts) going in, reflects once off the back of each drop, and bends again on the way out. Different colors leave at slightly different angles, so the drops that send light to your eye all sit about 40 to 42° from the antisolar point. That's the point directly opposite the sun, which is always where the shadow of your head falls. Every point on a circle at that angle around your shadow sends rainbow light to you, so the primary rainbow is a ring, red on the outside and violet on the inside. From the ground, the antisolar point is below the horizon whenever the sun is up. You see only the part of the circle above the ground, and only if there are raindrops there. When the sun is right on the horizon you get a half circle, and the higher the sun, the smaller the arc. Once the sun is higher than about 42°, no primary bow appears at ground level. From an airplane, a mountain or a tall building, drops can lie below you too, so you can sometimes see the whole ring. A glory is a different effect: smaller, tighter colored rings around the shadow of an aircraft on cloud. The footage shows a bright rainbow arcing down past the horizon toward the water below, filmed from high above a waterfront.
• DD-652 Spacewalker: On February 7, 1984, during shuttle mission STS-41B, Bruce McCandless II made the first untethered free flight in space. He was flying NASA's Manned Maneuvering Unit (MMU), a backpack propelled by nitrogen gas jets and steered with hand controllers. NASA says he flew out to 150 ft, came back, then flew out to about 320 ft (about 98 m) from Challenger before returning. Crewmate Robert L. Stewart flew the same MMU later in that spacewalk, so both men made untethered flights on the mission's first EVA. The flights were practice for repair and retrieval work. Two satellites deployed on STS-41B ended up in useless orbits, and in November 1984, STS-51A astronauts Joseph Allen and Dale Gardner used MMUs to help capture them. That was the last time the MMU flew. Later shuttle spacewalkers stayed tethered, with the smaller SAFER unit as a backup.
• DD-653 Murmuration: Murmurations are the swirling pre-roost flocks of common starlings (Sturnus vulgaris), usually seen on autumn and winter evenings. In 2008, the STARFLAG team in Rome reconstructed flocks of thousands of birds in 3D. They found each starling responds to a fixed number of nearest neighbors, about six or seven, rather than to every bird within a set distance. This 'topological' rule helps a flock stay together even as its density changes sharply under attack. A 2017 citizen-science study by Goodenough and colleagues analyzed thousands of UK reports. It found murmurations were bigger and lasted longer when predators such as peregrine falcons and sparrowhawks were around, which supports the 'safety in numbers' explanation. The study found little support for the idea that birds gather to keep warm. Studies of falcon attacks show waves of dark and light rippling away from the predator, and more waves were linked to fewer successful attacks. The idea that murmurations share information about feeding sites is still only a hypothesis.
• DD-654 UV Face: A UV camera records ultraviolet light bouncing back from a scene. Sunscreen filters stop most of that UV from reaching the skin and bouncing back, so covered skin looks dark and bare skin looks lighter. A 2016 study by Cole and colleagues measured the mineral filters zinc oxide and titanium dioxide. Despite the old 'physical blocker' label, they reflected only about 4-5% of UV, and the rest of their protection came from absorption. Above their absorption edge, in long UVA and visible light, they mainly reflect, which is why thick mineral sunscreen can look white. Organic ('chemical') filters also absorb UV. The camera's look has a practical use. In a 2017 University of Liverpool study, UV imaging of 57 people showed sunscreen was missed on about 14% of the eyelid region, compared with about 7% of the rest of the face. Under UV light, skin pigmentation such as freckles also shows up more strongly.
• DD-655 The Kaaba: The Kaaba stands at the center of the Masjid al-Haram (the Sacred Mosque, often called the Great Mosque) in Mecca, Saudi Arabia, and is the most sacred site in Islam. Islamic tradition holds that the Prophet Ibrahim (Abraham) and his son Ismail (Ishmael) built it as a house for the worship of one God. It's roughly cube-shaped, about 13.1 m high, 12.8 m long and 11.03 m wide. The structure has been rebuilt several times in its history, and the 1629 reconstruction used large granite blocks. The Black Stone is set in its eastern corner. The Kaaba is the qibla, the direction Muslims face in prayer. During Hajj and Umrah, pilgrims perform tawaf, walking around it seven times counterclockwise. Its covering, the Kiswah, is made each year at the King Abdulaziz Complex for the Holy Kaaba Kiswa in Mecca. It's black natural silk embroidered with Qur'anic verses in silver thread plated with gold, weighs around 1,400 kg, and in recent years has been changed at the start of the Islamic new year, on 1 Muharram.
• DD-656 Hajwala: Hajwala is a Gulf term for reckless, show-off street driving. Its best-known form, high-speed drifting, is called tafheet in Saudi Arabia. In 'Joyriding in Riyadh' (Cambridge University Press, 2014), based on four years of fieldwork, the scholar Pascal Menoret traces it to Riyadh. It emerged after the city was planned around wide roads and oil reshaped the economy, and young men, many of them rural migrants, took it up as a way to claim urban space. Drivers spin and slide cars, sometimes rented or stolen, on public avenues and highways in front of crowds. Gulf News dates the culture to the 1970s. It's illegal. Saudi traffic authorities treat drifting as a serious offense. Penalties announced in 2016 rose from SR20,000 and impoundment for a first offense up to SR60,000, possible jail and permanent confiscation for repeat offenses. Riyadh traffic police said in 2025 that fines reach SR60,000, with impoundment and referral to court. The footage includes a car tipped up on two wheels on a highway, a stunt that's part of the same culture.
• DD-657 Vertical Farming: In aeroponics, plant roots hang in the air inside a closed chamber and are sprayed or misted with nutrient solution. Aeroponic towers stack plants up a vertical column, with a pump lifting the solution to the top so it sprays or trickles down over the roots. NASA worked with AgriHouse on aeroponic research for space crops. A 2006 NASA Spinoff article reported up to 98% less water, 60% less fertilizer and no pesticides compared with soil growing, and yields 45-75% higher. Those figures come from NASA and the company, not independent field trials. Towers like those in the footage do best with leafy greens and herbs. The big catch for indoor vertical farms is energy for lighting and climate control, according to the National Center for Appropriate Technology (NCAT). Several heavily funded companies have struggled: AeroFarms filed for Chapter 11 bankruptcy in 2023, and Bowery Farming shut down in November 2024.
• DD-658 Buoyancy Bridge II: The Shiziguan floating bridge, nicknamed 'Langqiao Yimeng' after the Chinese title of 'The Bridges of Madison County', is in the Shiziguan Scenic Area, Zhushan Town, Xuan'en County, Enshi Prefecture, Hubei. It sits on water held back by the Shiziguan hydropower project, which since 2002 has dammed the Hongjia River (Hongjiahe), between steep hills. The deck has no fixed foundation. Pine joists and treated wooden planks sit on plastic floats and are held in place by underwater anchoring. Construction began in early 2015 and it opened in 2016. Scenic-area material gives its length as 400 m, while the official accident investigation gives 318 m, with a 4.5 m width and a 20 km/h speed limit. On May 16, 2023, a nine-seat van carrying eight people skidded through the railing on a bend and fell into the water, and five people died. Investigators found the van was going over the speed limit on a wet deck and that the scenic area had let vehicles above its size limit onto the bridge. The scenic area closed and reopened on December 28, 2024, after upgrades.
• DD-659 ProsperiTree: The Tree of Prosperity is a free kinetic show in the Rotunda of Wynn Macau, on the Macau peninsula. It isn't at Wynn Palace, the company's newer resort in Cotai. Macao's tourism office and Wynn describe an 11 m (about 38 ft) tree with 60 main limbs, more than 2,000 branches and 98,000 leaves made of 24-karat gold leaf and brass leaf, so the leaves aren't solid gold. During each show, a Chinese zodiac ceiling opens like an iris to reveal a 20 m LED screen and a crystal chandelier, and the tree rises from below the floor and turns to music while lights cycle through the seasons. A 2008 trade report credits mechanical engineering to McLaren Engineering, fabrication to Show Canada in Montreal and automation to Stage Technologies. The show's integrator dates the Tree of Prosperity show to 2006 and says a Dragon of Fortune show was added in 2010; the two alternate in the Rotunda. I found no source naming a designer 'Kevin McCurdy' or giving a cost of 'HKD 2 billion'.
• DD-660 BAPS NJ: BAPS Swaminarayan Akshardham, in Robbinsville Township, New Jersey, was built by the Hindu organization Bochasanwasi Akshar Purushottam Swaminarayan Sanstha (BAPS). It was formally dedicated on October 8, 2023, and opened to the public on October 18. The AP called it the largest Hindu temple built outside India in the modern era, and NBC News called it the largest in the U.S. The 183-acre figure (NBC also cites 185) is for the whole campus, not the mandir building. Work began in 2011, so construction took about 12 years. BAPS says about 12,500 volunteers took part. About 2 million cubic feet of stone was used, and a 2023 report counted about 4.7 million hours of artisan and volunteer work. The stone came from several countries, including Bulgarian and Turkish limestone, marble from Italy, Greece and Turkey, granite from India and China, and Indian sandstone. It was carved by artisans in India, dry-fitted there, then shipped about 8,000 miles to New Jersey for assembly. A 2021 federal lawsuit by workers who came on religious visas alleged forced labor and very low pay. BAPS says the artisans were religious volunteers. Twelve of the original plaintiffs withdrew their claims in October 2023, and the lawsuit is ongoing.
• DD-661 State Flag Square: State Flag Square in Baku, Azerbaijan, opened on September 1, 2010, on the Caspian Sea shore. Its flagpole is 162 meters (531 feet) tall and was briefly the world's tallest before being surpassed in 2011. The flag was raised to mark national independence and identity. The footage, credited to an account whose name is partly obscured on screen (RealRo...k), shows the flag over the city.
• DD-662 Ant Rafting: Red imported fire ants (Solenopsis invicta) come from the flood-prone wetlands of Brazil. When water rises, a colony can link itself into a floating raft that carries workers, brood and the queen. In a 2011 PNAS study, Mlot, Tovey and Hu of Georgia Tech filmed raft-building and measured how it works. Ants grip each other jaw-to-leg and leg-to-leg. A single ant's cuticle is only mildly water-repellent, but linking together boosts the colony's water repellency, much like weaving a waterproof fabric. Air trapped around and between the ants cut the raft's average density by about 75%, to about 0.2 g/mL. That trapped air also lets the ants on the bottom breathe, so they rarely drown. About half the ants form the bottom layer. Ants on top walk to the edge and get trapped there by their neighbors, which is how the raft grows. The paper describes rafts floating for days, and Hu's group told reporters they can last up to about three weeks, though most begin to fall apart after a week. Ants also build bridges, ladders and chains in the same way.
• DD-663 Atomic Stop-motion: IBM Research released 'A Boy and His Atom' on April 30, 2013, and Guinness World Records certified it as the world's smallest stop-motion film. Scientists at IBM's Almaden lab in San Jose used a scanning tunneling microscope (STM) to drag carbon monoxide molecules across a copper surface, one frame at a time. The microscope ran at about -268 °C (5 K), cold enough to hold the molecules in place, and magnified the surface more than 100 million times. Each CO molecule shows up as a dot. The team made 242 frames, each 45 by 25 nanometers, and Guinness says they did it between January 29 and February 6, 2013. Four researchers worked 18-hour days for about two weeks, using a few dozen molecules. Guinness describes the animation as 60 seconds long; the YouTube upload runs 1 minute 33 seconds with titles and credits. The film was outreach for IBM's atomic-scale data storage research, which in 2012 stored one bit of data in 12 atoms.
• DD-664 Tanzanian Half-Moons: Half-moons are semi-circular bunds, called demi-lunes in Francophone Africa. Each is a shallow basin dug in a crescent, with the dug-out soil piled into a low curved bank on the downslope side and the open side facing uphill. They're laid out in staggered rows along the contour so rain running off hard, crusted ground pools in each crescent and soaks in instead of washing away. FAO's water-harvesting manual describes them as a modern technique, not a traditional one, and gives an example from Niger's Tahoua region in the mid-1980s. Sizes vary from about 2 m in radius for crops and trees to 6-20 m for rangeland. In northern Tanzania, the Dutch nonprofit Justdiggit works with LEAD Foundation, Trias and Maasai communities in the Arusha and Manyara regions. It reports more than 50,000 'water bunds' dug there, along with grass seed banks and tree regrowth from old stumps. Results depend on rain, seeding and grazing control. A 2024 remote-sensing study of Kenyan and Tanzanian sites found mixed vegetation changes, and Justdiggit's own evaluation flags overgrazing as a risk.
• DD-665 Walking Floors: A moving-floor trailer unloads itself through the back doors without tipping. The floor is made of long slats, usually aluminum, split into three interleaved groups and driven by hydraulic cylinders under the trailer. All the slats slide rearward together, carrying the load a short distance. Then the groups pull forward one at a time. Because two-thirds of the floor is always holding still, friction keeps the load from sliding forward with the moving third. Repeating the cycle 'walks' the cargo out the back. 'WALKING FLOOR' is a trademark of KEITH Manufacturing of Oregon. Its founder, Keith Foster, introduced the first commercially viable all-hydraulic moving floor for semi-trailers in 1973, and other makers sell similar 'moving floor' or 'live floor' systems. Because the trailer never tips, it can unload under low roofs or on uneven ground. It's widely used for wood chips, bark, biomass, waste, scrap, recycling and farm produce.
• DD-666 Kangina Grapes: Kangina (also spelled gangina or kangana) is an Afghan way of keeping fresh grapes through winter in sealed containers made of mud and straw. In summer, families shape mud and straw into pairs of shallow bowls and dry them in the sun for a few hours. At harvest, they fill one bowl with fresh grapes, cap it with the other and seal the seam with more mud. Each kangina in a 2025 Xinhua report held about 1 kg. Stored in a cool, dry place, the sealed vessels keep grapes fresh for up to about six months, from early October to late March according to Kabul-area vendors. Many are opened for Nowruz, the spring new year. The method works best with Taifi, a thick-skinned, late-season grape. The tradition is strongest in the Shomali Plain and Kalakan district north of Kabul, and vendors sell kangina grapes through the winter. The method had been studied very little until recently. A 2022 study of Taifi grapes stored at room temperature for 50 days found gangina effective but heavy and fragile. Styrofoam boxes cut moisture loss but led to more rot.
• DD-667 Digital ID: The Reel blends two separate UK projects. The first is GOV.UK Wallet, announced on January 21, 2025. It's an optional app for storing government-issued documents on a phone, starting with the HM Armed Forces Veteran Card and with a digital driving licence planned. The government said every government-issued credential should be available digitally by the end of 2027, alongside the physical versions. Its technical documents say credentials are tied to the user's GOV.UK One Login account and device, can't be moved to another device, and can be revoked by the issuer. The second project is a national digital ID. On September 26, 2025, Prime Minister Keir Starmer announced a free digital ID for citizens and legal residents. The government said it would be mandatory for right-to-work checks by the end of the Parliament, to curb illegal working, and would make it easier to use public services. Critics including Big Brother Watch and a coalition of 13 NGOs warned of mission creep, surveillance, data-security risks and exclusion. A parliamentary petition against digital ID cards gathered more than 2.9 million signatures and was debated on December 8, 2025. In January 2026, the government dropped the plan to require the digital ID itself for right-to-work checks, saying other digital documents such as eVisas and e-passports could be used. It published a consultation in March 2026. In May 2026, the Home Affairs Committee called the original announcement 'rushed' and 'poorly thought through'. On July 21, 2026, the government cancelled the national digital ID programme; Reuters reported the decision as one of new Prime Minister Andy Burnham's first moves. In its September 2026 response to the committee, the government said GOV.UK One Login, GOV.UK Wallet and digital credentials such as the Veteran Card and driving licence will continue as separate projects. Employers must still carry out right-to-work checks, but won't be required to do them digitally.
• DD-668 Stick Walk: The Banna (also written Bena) are a people of the Lower Omo Valley in southern Ethiopia's South Omo Zone. They live in the higher country around the market town of Key Afer and are closely related to their Hamar neighbors, with whom they share the Hamar-Banna language and major ceremonies. Their best-known tradition, the one in the footage, is stilt-walking, not walking with sticks. Young men and boys strap their feet to tall wooden poles and stride across roads and fields, sometimes about three meters above the ground. A 2026 DW report describes it as an old herding skill that helps young herders watch over their animals and stay safe from snakes. Other accounts describe it as a rite of passage and a performance at festivals, where stilt-walkers may paint their bodies with white stripes. Explanations vary, and some accounts doubt the practical origin story. Stilt-walking now also draws tourists, which DW reports brings extra income along with outside influences. The footage shows young men on long stilts walking along a road and across red earth, with green hills behind.
• DD-669 Point Curie: The Curie point, or Curie temperature, is named after Pierre Curie. His 1895 thesis, 'Propriétés magnétiques des corps à diverses températures' (Magnetic properties of substances at various temperatures), showed how magnetism changes with temperature. In a ferromagnet such as iron, a quantum effect called exchange interaction lines up the atoms' magnetic moments within small regions called domains. Above the Curie temperature, heat scrambles that alignment. The material loses its spontaneous magnetization and becomes paramagnetic: it's only weakly attracted to a magnet, and only while a field is applied. The Curie temperature is about 770 °C for iron, 358 °C for nickel and about 1,115 °C for cobalt. That's why a red-hot piece of iron stops sticking to a magnet and is attracted again as it cools. Being below the Curie point doesn't automatically make something a permanent magnet. In an ordinary iron nail the domains point in different directions and cancel out, which is why the nail isn't a magnet until it's magnetized. Antiferromagnets have a similar transition called the Néel temperature. The footage shows a torch heating a small metal piece until it glows, while a magnet on a rod hangs above it.
• DD-670 Argyroneta Aquatica: The diving bell spider, Argyroneta aquatica, is generally described as the only spider that spends almost its whole life underwater. It lives in ponds and slow, plant-filled fresh water across Europe and northern Asia. It spins a silk sheet among water plants and fills it with air to make a 'diving bell'. It carries the air down from the surface as a silvery film trapped by hairs on its abdomen and legs, which is why it looks silver underwater. Inside the bell it rests, eats prey and molts, and females lay their eggs there. In 2011, Roger Seymour and Stefan Hetz reported in the Journal of Experimental Biology that the bell also works as a physical gill. Oxygen dissolved in the water diffuses into the bubble as the spider uses it up. In their measurements, that inflow could meet a resting spider's oxygen needs, even in warm, stagnant water. Nitrogen slowly diffuses out, so the bell shrinks and has to be topped up. The spider can stay down for more than a day rather than surfacing every 20 to 40 minutes, as had been thought. The footage shows the spider underwater, its body coated in a silver air bubble, among water plants.
• DD-671 Gyotaku: Gyotaku (from gyo, 'fish', and taku, 'impression') is the Japanese practice of printing fish. The oldest known gyotaku, Kinshibori no funa ('Crucian Carp from the Kinshibori Canal'), is dated to 1839. It records a crucian carp caught in Edo (now Tokyo) by Sakai Tadaaki, ninth lord of the Shōnai domain, and is kept at the Tsuruoka City Museum of Local History. Nippon.com reports that the Shōnai region around Tsuruoka in Yamagata Prefecture is considered gyotaku's birthplace. The domain encouraged its samurai to fish from the rocky shore as training, and they used prints to record their big catches. There are two main methods. In the direct method (chokusetsuhō), ink or paint goes on the fish and paper is pressed over it, which gives a mirror image. In the indirect method (kansetsuhō), thin damp washi paper is molded onto the fish and color is dabbed on with a silk-wrapped pad called a tanpo, like a rubbing. After photography spread in the postwar period, colorful 'art gyotaku' grew into a style of its own. Researchers have also used old gyotaku as historical records of fish sizes and species. The footage shows the technique on an octopus, which is inked, printed on paper and finished with a red seal stamped on the print. Gyotaku is traditionally done with fish, and octopus and squid prints are also common.
• DD-672 Kirk: Charles James 'Charlie' Kirk (October 14, 1993 – September 10, 2025) was an American conservative political activist and media personality. He was born in Arlington Heights, Illinois, and raised in nearby Prospect Heights. In June 2012, at 18, he co-founded Turning Point USA (TPUSA) with businessman Bill Montgomery, as a student organization promoting free markets and limited government. He led it as its public face for 13 years and became widely known for campus debates and his daily program, The Charlie Kirk Show. On September 10, 2025, he was shot and killed while speaking at a TPUSA event at Utah Valley University in Orem, Utah, at age 31. A suspect, Tyler Robinson, was arrested two days later and charged with aggravated murder. Kirk's widow, Erika Kirk, was elected CEO of TPUSA on September 18, 2025, and he was posthumously awarded the Presidential Medal of Freedom on October 14, 2025. He was a polarizing figure who drew both strong support and strong criticism, and this case sticks to the documented record.
• DD-673 The Wailing Wall: The Western Wall (Hebrew HaKotel HaMa'aravi, 'the Kotel') is a limestone wall in Jerusalem's Old City. It's the more common name. 'Wailing Wall' comes from European descriptions of Jews mourning the Temple's destruction there, and in Arabic it's called al-Buraq Wall. The wall isn't part of the Temple building. It's a stretch of the western retaining wall that Herod the Great built, starting around 19 BCE, when he enlarged the platform of the Temple Mount. The Romans destroyed the Second Temple in 70 CE, but the retaining wall survived. The full wall is about 488 m long, with roughly 19 m exposed above the prayer plaza. The lowest visible courses are Herodian, and the upper layers were added in later periods. Because of restrictions on prayer on the Temple Mount itself, the Wall is the holiest place where Jews are permitted to pray. The site sits beside the Temple Mount/Haram al-Sharif compound, which is also sacred to Muslims, and it's religiously and politically sensitive.
• DD-674 Anti-Defamation League: The Anti-Defamation League (ADL) is a New York-based 501(c)(3) nonprofit. B'nai B'rith, a Jewish service organization, founded it in Chicago in autumn 1913, with attorney Sigmund Livingston as its first leader. Wikipedia's account places the founding in the wake of the contested murder conviction of Leo Frank that year. The ADL became independent of B'nai B'rith in 2009, and Jonathan Greenblatt has been its CEO since 2015. The ADL describes its purpose as protecting the Jewish people and fighting antisemitism and hate. It's known for incident audits, research on extremism, law-enforcement training and pro-Israel advocacy. The ADL is politically contested. Critics on the left have accused it of conflating criticism of Israel with antisemitism. In late 2025, conservative critics, including Elon Musk and FBI Director Kash Patel, attacked its extremism research after its glossary included an entry on Turning Point USA. The ADL took the glossary down, the FBI announced it was cutting ties, and the ADL said it remained committed to protecting the Jewish people. This case reports those claims with their sources and doesn't judge them.
• DD-675 Siwa Salt Oasis: Siwa is an oasis town in Egypt's Matrouh Governorate, in a depression that reaches about 19 m below sea level. It lies about 50 km east of the Libyan border and 560 km from Cairo, and about 25,000-30,000 people live there. It has roughly 200 natural springs (one study counts 226) and several large salt lakes. Most springs draw on a shallow limestone aquifer, the Tertiary Carbonate Aquifer, which is moderately to highly saline. A 2026 study found that the shallow aquifer is recharged mainly by upward flow from the deep Nubian Sandstone Aquifer, whose 'fossil' paleowater is about 4,300 to 14,200 years old. Because Siwa is a closed basin, excess irrigation and drainage water has nowhere to go. The salt lakes grew from about 23 km² in 1990 to about 61 km² in 2020, and Egypt's water ministry calls waterlogging and salinity chronic problems. The vivid turquoise pools that visitors float in are very salty. The oasis was also home to the ancient oracle of Amun, which Alexander the Great visited.
• DD-676 CIPP: Cured-in-place pipe (CIPP) is a trenchless way to rehabilitate sewer, storm, water and other pipes. A flexible tube of felt or fiberglass is soaked in thermosetting resin (polyester, vinyl ester or epoxy). It's either inverted into the host pipe with water or air pressure, or pulled in and inflated. The resin is then cured with hot water, steam or, for glass-fiber liners, UV light. The result is a jointless pipe-within-a-pipe, usually a few millimeters to a few centimeters thick. Engineer Eric Wood first used the method in London in 1971, and it was commercialized as Insituform. A 2012 US EPA retrospective found sampled municipal sewer liners generally in good condition after years in service. Researchers at Purdue (2017) reported that steam-cured installations release a mix of chemical vapors, including styrene, which raised worker- and public-exposure concerns. Service connections have to be reopened from inside, usually by robotic cutters.
• DD-677 Hydrant Hygiene: Fire hydrants are opened outside emergencies for three main reasons. First, inspection: checking that the hydrant opens, drains and is serviceable. Second, flushing: moving water fast enough to scour sediment, rust and stale water out of mains. Third, flow testing: measuring static and residual pressure and flow to rate a hydrant and model the network. Who does the work varies by city. In New York, the FDNY inspects hydrants twice a year (spring and fall), opening each one and flushing its barrel, while the Department of Environmental Protection carries out hydrant flow tests. New York State rules for water corporations require hydrants to be inspected and tested at least every three years, with methods from the AWWA M17 manual. The brown water often seen in videos is sediment and iron stirred up from the pipes. Flushing can briefly discolor tap water nearby.
• DD-678 ATL Air Traffic: Hartsfield-Jackson Atlanta International Airport (ATL) was again the world's busiest airport by passengers in 2025, with 106.3 million passengers. That was down 1.6% from 2024, and Dubai (95.2 million) and Tokyo Haneda (91.7 million) were closing the gap, according to Airports Council International. ACI says four of the five US airports in the top 20 are mainly domestic hubs, with 80-95% domestic passengers, which describes ATL's traffic. By aircraft movements, though, Chicago O'Hare ranked first in 2025. ATL has five parallel runways and two terminals, the Domestic Terminal and the Maynard H. Jackson Jr. International Terminal, with seven concourses linked by an underground train. It's Delta Air Lines' main hub and is named after two Atlanta mayors, William B. Hartsfield and Maynard Jackson.
• DD-679 Feminizing Frogs: Atrazine is a weedkiller widely used on US corn, sorghum and sugarcane. In 2002, Tyrone Hayes's lab at UC Berkeley reported that male African clawed frogs (Xenopus laevis) raised in water with as little as 0.1 parts per billion of atrazine developed gonadal abnormalities, including hermaphroditism, and smaller larynxes. A 2010 study from the same lab found that exposed genetic males were demasculinized, and about 10% developed into functional females that laid eggs. Other labs, including studies funded by the manufacturer, did not consistently reproduce these effects. In 2007, the US EPA weighed 36 studies and concluded that atrazine does not produce consistent, reproducible effects on amphibian gonadal development. A 2010 review by Rohr and McCoy found fairly consistent sublethal effects on fish and amphibians, such as on metamorphosis and immune measures. The EU hasn't allowed atrazine since 2004, largely because of groundwater limits. The US still permits it, and in 2024 the EPA set its aquatic level of concern at 9.7 µg/L, based on aquatic plant communities.
• DD-680 Yonshakudama: Yonshakudama means '4-shaku shell'. A shaku is an old Japanese unit of about 30 cm, so the shell is about 120 cm across. It's the showpiece of the Katakai Fireworks Festival in Ojiya, Niigata, held on September 9-10 each year as an offering to Asahara Shrine. According to the festival, the shell weighs about 420 kg, climbs to about 800 m and bursts into a sphere about 800 m wide. Katakai first launched one successfully on September 10, 1985, and Guinness recognized it as the largest aerial firework shell at 418 kg. That record has since passed to a 4-shaku shell launched at the Kounosu festival in Saitama on October 11, 2014. It weighed 464.826 kg, reached 907 m at the top of its burst and spread 748 m wide.
• DD-681 Ursine Uptime: 'Walking hibernation' is a real term. The North American Bear Center describes it as the 2-3 weeks after bears leave the den, when they move around but eat and drink less than normal while their bodies return to summer levels. In a 2011 Science study, Øivind Tøien and colleagues continuously monitored black bears (Ursus americanus) in Alaska. They found the bears cut their metabolism to about 25% of the basal rate while body temperature fell only modestly, cycling between about 30 and 36 °C. Heart rate dropped from about 55 to as few as 9 beats per minute, and metabolism stayed reduced for up to three weeks after the bears emerged. Studies of brown bears in Sweden found body temperature normalized about 10 days after emergence, and heart rate took about a month. Black bears in closed dens go 5-7 months without eating, drinking, urinating or defecating, but mothers in open dens may lick meltwater and clean up after cubs.
• DD-682 One Incense Pillar: One Incense Pillar (Yizhuxiang, 'one stick of incense') is a limestone karst pillar in the Enshi Grand Canyon, a national 5A scenic area and geopark in Enshi, western Hubei. Scenic-area descriptions give it a height of 150 m, a base diameter of 6 m and a minimum diameter of 4 m. They attribute its stability to flat-lying Triassic limestone beds with high compressive strength. Tourism and media sources say it has withstood several major earthquakes, though I found no independent geological documentation of specific quakes. Local Tujia legend says a deity gave the pillar to the people as an incense stick to light in times of disaster. The canyon itself runs about 108 km.
• DD-683 Turtle Torpor: Turtles stay underwater in two quite different ways. Sea turtles, like the one in the footage, are air-breathers. They rely on oxygen stored in their lungs, blood and muscles, plus a low resting metabolism. A study of wild green turtles (Chelonia mydas) found they maximize time underwater on resting dives and then take five to seven breaths at the surface. Reviews of sea turtle diving report single breath-hold dives of over 10 hours. Absorbing oxygen from water is mainly a trick of some freshwater turtles. Australia's Fitzroy River turtle (Rheodytes leukops) pumps water through enlarged cloacal bursae. In the wild its dives averaged about 33 minutes and reached up to 623 minutes, and hatchlings got 63-73% of their oxygen from water. That works best in cool, oxygen-rich water. In warm summer water the same turtle becomes reliant on air. Some other species exchange gas through the lining of the mouth and throat.
• DD-684 Arapaima Gigas: Arapaima gigas (pirarucu) is one of the largest freshwater fish in the world, native to the Amazon basin. FishBase gives a common length of about 2 m and maximum reports of 4.5 m and 200 kg. Very large historical records are poorly documented. It's an obligate air-breather. It uses a lung-like swim bladder and has to surface roughly every 5-15 minutes, which is a big part of why it has been easy to overfish. Its large overlapping scales have a hard mineralized outer layer over flexible layers of collagen fibers. Studies by Marc Meyers and colleagues found piranha teeth can't easily penetrate them. It feeds mainly on fish by suction, and birds or small animals are occasional prey. Taxonomy is unsettled. The genus Arapaima was long treated as a single species, but work by Donald Stewart (2013) revived and described additional species, such as A. leptosoma, so 'arapaima' doesn't always mean A. gigas. The IUCN lists A. gigas as Data Deficient.
• DD-685 Bos Gaurus: The gaur (Bos gaurus) is the largest living wild bovine. It belongs to the cattle genus Bos, so the common Indian name 'Indian bison' is a misnomer, since true bison belong to the genus Bison. India's national studbook (Central Zoo Authority) gives adult bulls a typical shoulder height of about 1.6-2.0 m and a weight of about 600-1,000 kg (roughly 1,300-2,200 lb), with cows smaller at about 450-800 kg. A muscular ridge over the shoulders gives the back its humped profile, and both sexes carry curved horns. Gaur live in forests, forest edges and grassy clearings from India and Nepal through mainland Southeast Asia to the Malay Peninsula. The global population is estimated at 13,000-30,000, about 85% of them in India, and the species is listed as Vulnerable by the IUCN. The gayal or mithun (Bos frontalis) is generally considered its domesticated form.
• DD-686 Lux or Luxor: Luxor Las Vegas opened on October 15, 1993, as a 30-story, 350 ft (106.7 m) pyramid clad in dark glass. Circus Circus Enterprises built it. At opening the pyramid held 2,526 rooms. Guests reach them by 'inclinators', elevators that run diagonally up the pyramid's corners at a 39-degree angle, around what Luxor promotes as one of the world's largest atriums. Two 22-story ziggurat-shaped hotel towers added in 1997 brought the resort to about 4,400 rooms, so not all of Luxor's rooms are in the pyramid. The sphinx at the entrance is a stylized, roughly 10-story version, taller than the Great Sphinx at Giza. At the apex, the Luxor Sky Beam shines straight up and has been promoted as the strongest beam of light in the world, which may be the 'lux' in the title.
• DD-687 Counter Crane: A crane tips over when the overturning moment (the load's weight times its distance from the tipping line, plus wind and slope effects) exceeds the stabilizing moment from the crane's own weight and counterweight. Counterweights sit behind the slewing center to add stabilizing moment. On mobile cranes they're usually stackable cast-iron or steel slabs, like the '10 t' plates in the footage. Tower cranes often use concrete blocks. Counterweight isn't free stability, though. With the boom raised steeply and no load, too much counterweight can tip a crane backward, so standards such as ISO 4305 require backward-stability checks. Outriggers widen the support base. A crane's safe capacity comes from the manufacturer's load chart for its exact counterweight, boom length, radius and outrigger setup, and capacity falls fast as the load moves farther out.
• DD-688 da Vinci's Double Helix: The staircase in the footage is the double-helix staircase at the heart of the Château de Chambord in the Loire Valley, France. Two independent flights wind around each other and a hollow, partly open core, so people on one flight can see people on the other through the openings but never meet them. Leonardo da Vinci lived in France from 1516 as François I's 'first painter, architect and engineer of the king', and his notebooks include central-plan palaces and double and quadruple spiral stairs. Chambord itself says the staircase was 'inspired by' Leonardo and its architecture 'influenced' by him. No surviving document names him as the architect, and most art historians see him as an adviser whose ideas were developed with Domenico da Cortona and the master builders. Leonardo died on May 2, 1519, and construction at Chambord officially began on September 6, 1519, four months later.
• DD-689 Peristaltic Pumps: A peristaltic pump is a positive-displacement pump. Rollers or shoes on a rotating head squeeze a flexible tube against a curved track, trapping 'pillows' of fluid and pushing them forward, while the tube springs back behind them to draw in more. The fluid only touches the inside of the tube, so the pump suits sterile, corrosive, shear-sensitive or hygienic fluids, and changing the tube is all it takes to switch fluids. The Reel gets one thing backwards, though. Peristaltic flow naturally pulses as each roller lifts off the tube. Manufacturers reduce pulsation with more rollers, offset or out-of-phase tube channels, dampers or compliant tubing, but don't eliminate it. The tube itself is the part that wears out. The design dates back at least to an 1855 US patent, and roller pumps later became standard for moving blood in medical equipment.
• DD-690 Arch of Titus: The Arch of Titus stands on the Velia at the eastern edge of the Roman Forum, where the Via Sacra climbs toward the Palatine. Its dedication (CIL VI 945) honors 'divus' Titus, meaning Titus after his death and deification. So it's dated after Titus died in 81 CE, to the early reign of his brother Domitian, around 81-82 CE. Its reliefs celebrate the Roman triumph that Titus and his father Vespasian held in 71 CE after the Judaean War, in which Roman forces captured Jerusalem and destroyed the Second Temple in 70 CE. The south panel shows soldiers carrying the Temple's spoils, including the seven-branched menorah. The north panel shows Titus in his chariot, crowned by Victory, and the vault shows his apotheosis. The arch is mostly Pentelic marble. In the Middle Ages it was built into a fortress, and Giuseppe Valadier restored it in the 1820s, filling missing parts with travertine. Its menorah image was later chosen as the basis for the emblem of the State of Israel.
• DD-691 Hungarian Herding Dogs: The Puli (plural Pulik) is a medium-sized Hungarian sheepdog. The American Kennel Club says the Magyars brought it to Hungary more than a thousand years ago to herd sheep over rough ground, where it might even jump onto the animals' backs. The AKC standard gives a height of about 16-17 inches and 25-35 lb, in solid black, rusty black, gray or white. Its coat cords naturally from about 10-12 months old, and it can be shown corded or brushed out. The large, cream-white dog in this Reel's footage looks more like a Komondor, Hungary's other corded breed. The Komondor is a much bigger livestock guardian rather than a herder. It's always white, at least about 25.5-27.5 inches tall, and its coat mats into flat cords that owners must separate by hand. Hungary also has other herding breeds, such as the Pumi and Mudi, so the title's plural is apt. Both the Puli and the Komondor were nearly lost during the Second World War.
• DD-692 Food Chain Hazing: Lions and spotted hyenas are Africa's two largest carnivores. They eat many of the same prey, so they compete directly for food. Lions often kill hyenas and their cubs, but they usually don't eat them. The killing removes a competitor rather than providing a meal. In Namibia's Etosha National Park, lions caused 71% of recorded hyena deaths in a one-year study (Trinkel & Kastberger, 2005). The rivalry runs both ways. Spotted hyenas are skilled hunters that kill most of their own food, and in some places they take carcasses from lions, especially when no adult male lions are around. Hyenas also 'mob' lions in groups to drive them away from dens.
• DD-693 Chicxulub Crater: The Chicxulub crater is a buried impact structure about 180 to 200 km across, centered near the town of Chicxulub on Mexico's Yucatán coast and extending under the Gulf of Mexico. It formed about 66 million years ago when an object roughly 10 km wide struck Earth, and the impact is tied to the end-Cretaceous mass extinction. Nothing of the crater is visible at the surface. It lies under about 1 km of younger sediment, and a ring of sinkholes (cenotes) traces its outline. Pemex geophysicists Glen Penfield and Antonio Camargo found it while searching for oil. It was identified as the impact site in 1991. In 2016, IODP-ICDP Expedition 364 drilled its peak ring, and a 2024 ruthenium-isotope study concluded the impactor was a carbonaceous asteroid that formed beyond Jupiter, not a comet.
• DD-694 Snake Supreme: Titanoboa cerrejonensis was a giant boid snake, a relative of today's boas and anacondas. Its fossils come from the Cerrejón coal mine in northeastern Colombia, in rocks 58 to 60 million years old, from the oldest known neotropical rainforest. Describing it in Nature in 2009, Jason Head and colleagues estimated it at about 13 m (43 ft) long and 1,135 kg. They also argued that a cold-blooded snake that size needed a mean annual temperature of about 30 to 34 °C. Later estimates run from about 12.8 to 14.3 m. In 2024, Vasuki indicus, a madtsoiid snake from India about 47 million years old, was estimated at 10.9 to 15.2 m. That makes it a possible rival, though Titanoboa's vertebrae are slightly larger.
• DD-695 Golf Balling: When a driver hits a golf ball, the ball flattens noticeably for a fraction of a millisecond and then springs back. The coefficient of restitution (COR) measures how much speed survives that collision: 1 means a perfectly elastic bounce and 0 means none. Because a livelier ball goes farther, golf's governing bodies cap it. In the USGA/R&A Initial Velocity test, a ball is fired at a rigid barrier at 143.8 ft/s. Its initial velocity is calculated from its COR and contact time, and a sample fails if four or more of 24 balls exceed 255 ft/s. Balls must also meet the 317-yard Overall Distance Standard. From January 2028, that test will be run at a 125 mph clubhead speed instead of 120 mph, which the USGA expects to cut the longest hitters' drives by about 13 to 15 yards.
• DD-696 Shine Sublime: A shoe shine follows a few basic steps: clean the leather, condition and color it, then build and buff a protective layer. Shoe creams are softer and richer in oils and pigment, so they nourish and recolor. Wax polishes leave a harder layer that gives shine and some water resistance. A 'mirror' or 'spit' shine comes from many thin coats of wax buffed with a little water. Modern tinned polish owes much to Kiwi. William Ramsay and Hamilton McKellar launched it in Melbourne in 1906, and its 1908 Dark Tan polish was marketed for restoring color and preserving leather. Through the 20th century, shining shoes was also a street trade, from bootblacks to the shoe-shine stands still found in stations and airports.
• DD-697 Rocket Stage Release: Stage separation is how a multistage rocket discards empty stages to save mass and reach orbit. Separation systems use explosive bolts or frangible joints, pneumatic pushers or springs, and sometimes small gas thrusters to push the spent stage away; the next stage then ignites its engine as the old stage falls away. The footage, credited to aerospacefanclub, shows an onboard view of a stage separating above Earth.
• DD-698 Haus des Glockenspiels: The Haus des Glockenspiels (Glockenspiel House) is at Böttcherstraße 4 in Bremen, northern Germany, not in Rothenburg ob der Tauber. Coffee merchant Ludwig Roselius, who first marketed decaffeinated coffee, had two old warehouses there rebuilt in 1922 as offices for a bank, with gabled red-brick facades. In 1934 a carillon of 30 Meissen porcelain bells was hung between the gables. While the bells play sea shanties and folk songs, a tower beside them turns to show 10 carved wooden panels. They depict people who crossed the ocean by sea or air, including Columbus, Lindbergh, and Zeppelin and Eckener. They're carved panels, not life-sized moving figures, and they don't show local history. The bells play at noon, 3 pm and 6 pm from January to March, and hourly from noon to 6 pm from April to December, except in frost.
• DD-699 Drone De-icing: Ice on power lines adds weight and can snap conductors or topple towers, as China's grid saw in the severe winter storms of early 2008. In January and February 2026, State Grid units in several Chinese provinces publicized drone-based de-icing during cold waves. In Shanxi, drones carrying insulating rods knocked ice off ultra-high-voltage lines (Xinhua). In Zhejiang, a DJI FC30 heavy-lift drone placed a robot on an overhead ground wire, where it broke ice by impact, knocking and rolling (China Daily). In Hubei, a 'flying de-icing robot' used vibration plus rotating blades on a ±800 kV line (ChinaNews). In Anhui, a drone-placed robot cleared about 20 m of iced wire in about a minute (CGTN). Utilities say the methods reduce the need for crews to climb towers or knock ice off by hand.
• DD-700 HoloFans II: 'Hologram fans' are persistence-of-vision (POV) displays. A rotor carrying strips of LEDs spins fast while a controller switches each LED on and off at exact angles, painting one slice of the picture at a time. Because the eye blends these rapid flashes, the viewer sees a steady image that seems to float, especially against a dark background where the blur of the blades disappears. They aren't holograms in the physics sense. True holography records and rebuilds light waves using interference, usually with lasers. A fan draws a flat (2D) image, and the 3D look comes from the artwork's shading and the invisible frame. HYPERVSN, the brand formerly known as Kino-mo, describes its units as four LED rays spinning at about 670 rpm, and several units can be synced into a larger 'wall'.
• DD-701 Shark Senescence: The Greenland shark (Somniosus microcephalus) lives in the cold, deep North Atlantic and Arctic. In 2016, Julius Nielsen and colleagues dated proteins in the core of the eye lens of 28 female sharks. Those proteins form before birth and aren't replaced. The team used radiocarbon, including the 'bomb pulse' from 1950s-60s nuclear tests, to estimate ages. The largest shark, 502 cm long, came out at 392 ± 120 years, which puts its likely age between 272 and 512 years. That makes the Greenland shark the longest-lived vertebrate known. The study also estimated that females reach sexual maturity at about 156 ± 22 years. Sharks like this grow only about 1 cm a year in near-freezing water.
• DD-702 New York Hot Tub: After the January 25, 2026 winter storm and days of below-freezing temperatures, the NYC Department of Sanitation (DSNY) started eight snow melters on January 27, 2026, its first use of them since 2021. Officials call the machines 'hot tubs'. Dump trucks haul piled snow to fixed melter sites in all five boroughs, where front-end loaders tip it in half-ton buckets into heated water. DSNY says each machine melts 60 to 120 tons an hour. The water is kept at about 38 °F, enough to melt snow while controlling flow, and drains into sewers the city's Department of Environmental Protection approved. In DSNY's own words: 'We bring snow to the melters – NOT the melters to the snow.'
• DD-703 Three Whale Rock: Hin Sam Wan ('Three Whale Rock') is a group of sandstone outcrops on a cliff edge in the Phu Sing National Reserved Forest, Bueng Kan province, near the Mekong River and the border with Laos. Seen from above, the three elongated rocks look like a whale family: father, mother and calf. Tourism sources and Wikipedia call the formation 75 million years old. A geology write-up identifies the rock as quartz-rich sandstone of the Phu Phan Formation, laid down by rivers in the Early Cretaceous, about 125 to 113 million years ago. It suggests the 75-million figure more likely reflects later uplift and exposure. Only two of the 'whales' can be reached on foot, and the 'baby' can't. The Tourism Authority of Thailand singles out early-winter sunrises, especially in November.
• DD-704 Ekranoplan: The Project 903 Lun was a Soviet wing-in-ground-effect craft from Rostislav Alexeyev's design bureau, built as a fast anti-ship missile carrier. Only one, MD-160, was completed. It was about 73.8 m long with a 44 m wingspan, weighed about 380 tonnes at takeoff, and carried six P-270 Moskit (SS-N-22) anti-ship missiles in pairs on its back. Eight Kuznetsov NK-87 turbofans on forward pylons blew air under the wings for takeoff. Published maximum speeds are about 500 to 550 km/h (about 310 to 340 mph). A CIA assessment quoted by The Aviationist gave about 250 knots. It entered trial service in the late 1980s or 1990, sources vary, and sat unused at Kaspiysk from the late 1990s. On July 31, 2020, it was towed to Derbent, Dagestan, for a planned Patriot Park display.
• DD-705 Battling Barnacles: Barnacles are crustaceans that cement themselves to hard surfaces, including ship hulls, as part of 'biofouling' along with slime, algae and other organisms. A 2007 study by Michael Schultz of the US Naval Academy, modeling a mid-sized naval frigate, predicted that heavy calcareous fouling such as barnacles and tubeworms raises the shaft power needed at cruising speed by up to 86%. Even slime films brought significant penalties. Hulls are protected with antifouling coatings and cleaned in dry dock or in the water by divers and robots. In-water cleaning has its own risks. The IMO's 2023 Biofouling Guidelines warn it can damage coatings and release invasive species and toxic coating debris. They say heavier fouling should be removed with systems that capture the debris.
• DD-706 Mount Bokty: Bokty is an isolated, trapezoid-shaped remnant mountain (an inselberg) in Kazakhstan's Mangystau region, about 90 km from Zhanaozen. It's protected within the Mangystau State Historical and Cultural Reserve. Local tourism sources say it stands 165 m high and that its name means 'pie' in Kazakh, after its cake-like layers. The bands are marine sediments laid down on an ancient sea floor and later carved by wind and water. The white layers are chalk, and the red and brown ones are colored by iron. Nearby, the Kyzylkup tract shows the same striping and is nicknamed 'Tiramisu'. The mountain looks like an upturned boat from one side and a striped pyramid from another, and it appears on Kazakhstan's 1,000-tenge banknote.
• DD-707 Lingshan Lift: The Reel mixes up two different Lingshans. The footage shows the new cliffside escalator at Lingshan Scenic Area in Shangrao, Jiangxi Province, a national 4A scenic area of granite peaks whose highest point, Tianti Peak, reaches 1,496 m. According to the scenic area as reported by Chinese media, the escalator line is 1,236 m long with a vertical rise of about 256 m, built as 10 sections in 5 groups. It can carry about 3,600 people per hour each way, turning a climb of 3-4 hours on foot into about 30 minutes. It went into trial operation in August 2025, and international outlets reported it open in October 2025. The 'Grand Buddha at Lingshan' and Taihu Lake belong to a different place: the Lingshan Scenic Area in Wuxi, Jiangsu Province, where an 88 m bronze Buddha completed in the 1990s stands on the north shore of Lake Tai. The escalator in the footage doesn't serve that Buddha or overlook Taihu Lake.
• DD-708 B52 Stratofortress: The Boeing B-52 Stratofortress first flew on April 15, 1952, and entered US Air Force service in 1955. Boeing built 744, and the last B-52H was delivered in 1962. Only the B-52H model is still flying. The Air Force fact sheet lists a payload of about 70,000 lb of mixed weapons and a 185 ft wingspan, with eight engines in four paired pods. It was built for high-altitude nuclear missions and was later adapted for low-level flight, conventional bombing and cruise missiles. Under the Commercial Engine Replacement Program, the Air Force plans to fit Rolls-Royce F130 engines and a new radar, rename the aircraft the B-52J and keep it in service into the 2050s. On June 15, 2026, a B-52H radar test aircraft crashed on takeoff at Edwards Air Force Base, killing all eight crew members. As of July 2026, the cause was under investigation.
• DD-709 Resting Rosie: Rosie is a preserved great white shark, about 5 m long, now on show at Crystal World Exhibition Centre in Devon Meadows, Victoria, Australia. She was caught in tuna nets off South Australia in 1997 or 1998 (sources differ) and couldn't be freed. She was then preserved whole in formaldehyde at Wildlife Wonderland, a park in Bass, Victoria. When that park closed in 2012, she was left behind in a shed. Late in 2018, urban explorer Luke McPherson's video of her went viral. Trespassers followed and damaged the tank, which let toxic formaldehyde escape. Crystal World's owner, Tom Kapitany, took her on, and she was craned out and moved on February 21, 2019. Her formaldehyde has since been replaced with glycerol.
• DD-710 USS Gerald R. Ford: USS Gerald R. Ford (CVN-78) is the lead ship of the US Navy's newest class of nuclear-powered aircraft carriers. It was delivered on May 31, 2017, and commissioned on July 22, 2017, at Naval Station Norfolk. According to the Congressional Research Service, its two A1B reactors give it about three times the electrical generating capacity of a Nimitz-class carrier. The class is designed for a sortie rate about 33% higher than the Nimitz class, with about 700 fewer shipboard crew. New systems include EMALS electromagnetic catapults, Advanced Arresting Gear and electromagnetic weapons elevators. Pentagon testers and the GAO have reported reliability problems and delays with several of them. The ship's first full deployment came in 2023.
• DD-711 Gassed Up...Way Up: Aerial refueling moves fuel from a tanker to another aircraft in flight. The first successful transfer took place on June 27, 1923, over Rockwell Field in San Diego. Two US Army Air Service DH-4B biplanes used a 50-foot hose to pass about 75 gallons, according to the National Museum of the US Air Force. Today there are two main methods. With probe and drogue, the tanker trails a hose ending in a basket and the receiver flies its probe into it. The US Navy, the Marine Corps, many allied air forces and helicopters use this method. With the flying boom, a boom operator on the tanker steers a rigid telescoping tube into a receptacle on the receiver. That's the standard for US Air Force aircraft. Some tankers carry both.
• DD-712 Eye of the Storm: NOAA describes a hurricane's eye as a relatively calm, generally clear area of sinking air, typically 20 to 40 miles across, where winds usually stay under 15 mph. An eye usually forms once sustained winds pass 74 mph. Air flowing out of the top of the eyewall partly turns inward and sinks, warming and drying as it falls, which clears the clouds. The calm doesn't reach the sea, though. The National Hurricane Center's mariner's guide warns that in the eye of a strong storm, seas are near their maximum height and come from several directions, which can produce rogue waves. Eyes vary a lot in size. In 2005, Air Force reconnaissance found Hurricane Wilma's eye had shrunk to about 2 nautical miles across.
• DD-713 Air Jordan: Michael Jordan won the NBA Slam Dunk Contest in 1987 and again on February 6, 1988, at Chicago Stadium. In 1988, he closed with a dunk from the free-throw line that earned a perfect 50 and edged out Dominique Wilkins, a result that's still debated. The dunk wasn't new. Julius Erving won the first-ever dunk contest, at the 1976 ABA All-Star Game, with a free-throw-line dunk, and Jordan had tried one in the 1985 contest. Both Jordan and Erving have said Erving suggested the 1988 attempt from the stands. 'Air Jordan' was also the name of Nike's Jordan signature shoe, launched in 1985.
• DD-714 2026: Metropolis, the German silent science-fiction film directed by Fritz Lang and written by Thea von Harbou, premiered in Berlin on January 10, 1927. Its city is split between a privileged elite above ground and workers who live and labor below. The year 2026 doesn't appear in the film. Von Harbou's novel says the story happens 'at no particular place or time'. The date comes from the 1963 Ace Books paperback, whose title page reads 'The World of 2026 A.D.' It was repeated in later writing on the film and in Giorgio Moroder's 1984 re-scored version. Film historians Lotte Eisner and Paul M. Jensen placed it around 2000 instead. Footage long thought lost was found in Buenos Aires in 2008 and restored for a 2010 re-release.
• DD-715 Stomata: Stomata are microscopic pores, each bordered by a pair of guard cells, that control a plant's intake of carbon dioxide and its loss of water vapor. Guard cells open the pore by taking up ions and water and swelling, and they close it when they lose turgor, for example in response to the drought hormone abscisic acid (ABA). Open stomata cover only about 5% of the leaf surface, but they're the main route of water loss (transpiration). Stomatal behavior shapes the global water and carbon cycles, and stomata appear in fossils from about 400 million years ago.
• DD-716 RoboWeaving: Braiding has been central to soft robotics since the McKibben artificial muscle, an inflatable bladder inside a braided sleeve. When pressurized, the muscle shortens and thickens, and the braid angle sets how far. Researchers have since braided many thin McKibben muscles together into bundles for musculoskeletal robots, 3D-printed braided sleeves, and used braiding with water-soluble fibers to make actuators that twist. Varying the braid pattern along the length lets one structure combine extension, contraction and twist. The footage shows a braiding machine and a braided robotic hand, but the Reel doesn't name the lab or project.
• DD-717 Plitvice Pure: Plitvice Lakes, in Croatia's Dinaric karst, are a chain of lakes linked by waterfalls. The water is supersaturated with calcium carbonate, which settles out with help from mosses, algae and bacteria to build porous tufa (travertine) barriers that dam the lakes. These barriers are the park's UNESCO 'outstanding universal value'. The water is clear and low in nutrients (oligotrophic), and tufa forms only when dissolved organic carbon stays low. Croatia proclaimed Plitvice its first national park on April 8, 1949, UNESCO inscribed it on October 26, 1979, and the park was enlarged in 1997 to just under 300 km².
• DD-718 Reservoir Ruin: Lake Mead (behind Hoover Dam) and Lake Powell (behind Glen Canyon Dam) are the two largest reservoirs in the United States, and both are fed by the Colorado River. The 1922 Colorado River Compact divided the river's water based on early-20th-century flows that later proved unusually wet. After a long drought, the Bureau of Reclamation declared the first-ever Lower Basin shortage in 2021. The 2007 operating guidelines expired at the end of 2026, and in August 2026 Reclamation adopted a new 2027-2036 framework, though the basin states didn't reach consensus. As of October 16, 2026, gauge data put Mead at about 26% full (1,037.43 ft, a record low) and Powell at about 23% full. Deliveries to the Lower Basin states will be cut by 1.25 million acre-feet in 2027.
• DD-719 Not So Well: In early 1991, retreating Iraqi forces set fire to Kuwaiti oil wells. Estimates of the number range from 605 to 732, and the U.S. government counted 610 burning out of 752 damaged wells. At their peak, the fires burned an estimated 4-6 million barrels of oil a day. Firefighting crews from 28 countries began work in April, and the last well was capped on November 6, 1991. Unburned oil formed lakes, estimated at more than 100 to about 300, and the soot and gases degraded regional air quality. Hardened 'tarcrete' crusts and oil-soaked soil left contamination that persisted for decades.
• DD-720 Big Boy 4014: Big Boy No. 4014 is one of 25 4-8-8-4 'Big Boy' articulated steam locomotives that the American Locomotive Company (ALCO) built for Union Pacific. It was delivered in December 1941. Big Boys normally hauled freight between Ogden, Utah, and Cheyenne, Wyoming, across the Wasatch range. No. 4014 made its last revenue run in July 1959 and was retired in December 1961 after 1,031,205 miles. It was then displayed in Pomona, California, until Union Pacific reacquired it in 2013. After a restoration that included converting it from coal to oil, it returned to service in May 2019 and is now the world's largest operating steam locomotive. In 2026 it made a 14-state coast-to-coast America250 tour.
• DD-721 Alsomitra macrocarpa: Alsomitra macrocarpa, sometimes called the Javan cucumber and formerly named Zanonia macrocarpa, is a climbing gourd of the Malesian forests, notably Indonesia's Sunda Islands. Its football-sized fruits hang high in the canopy and hold hundreds of seeds. Each seed is set in two papery wing membranes spanning about 13 cm, which Guinness lists as the world's largest winged seeds. When released, the seeds glide in a gently undulating flight called a phugoid. In 1897 the German professor Friedrich Ahlborn studied the seed's self-stabilizing shape. That work inspired Igo Etrich's 1904 tailless glider and, through it, the wing of the Etrich Taube, which first flew in 1910.
• DD-722 RoboClassical: In and around Carrara, Italy, studios such as Robotor use large multi-axis industrial robots to carve marble from 3D scans or digital models. Software turns the model into toolpaths and the robot removes stone. Bloomberg described a 4.5-ton robot working along nine axes. Robotor's co-founder Giacomo Massari told 60 Minutes the robots are about 10 times faster than hand carving, and says they do about 99% of the work. Skilled artisans still hand-finish the surfaces and details the machine can't reach, which can take months. Some Carrara sculptors object that robot-made work isn't true sculpture.
• DD-723 Fish Fattening: Bluefin tuna 'fattening' or ranching is capture-based aquaculture: wild tuna are caught, usually by purse seine, towed in cages to farms and fed for months before harvest, mainly for the Japanese sashimi market. In the Mediterranean, farms feed defrosted sardines, herring, mackerel and squid. Daily rations run about 2-10% of the caged biomass, and one Greek farm reported 5-8% of body weight a day at the start, falling to 2-3% near harvest. Feed conversion is poor, around 10-20 kg of baitfish per kg gained, because only about 5% of the energy goes into growth. Much of the gain is fat, which raises the price.
• DD-724 Algaecultural: Microalgae are grown in open ponds or in closed photobioreactors (glass or plastic tubes and panels) that supply light, CO2 and nutrients. The footage is credited to Jongerius ecoduna of Bruck an der Leitha, Austria. The company says its patented system uses vertical glass modules, moves the culture hydrostatically rather than with pumps, and runs continuously year-round in a 1-hectare plant that opened in 2018. The company's founders originally aimed at biodiesel but concluded algae were too valuable to burn, and the plant targets food, supplements and cosmetics. Algae biofuel is still not commercially competitive: ExxonMobil ended its algae program in 2022-23 after about $350 million.
• DD-725 The Glacier That Bleeds: Blood Falls is a sporadic outflow of brine at the snout of Taylor Glacier in the McMurdo Dry Valleys, where the glacier ends at ice-covered Lake Bonney. Griffith Taylor found it in 1911, and its color was first blamed on red algae. The source is ancient seawater, concentrated by freezing and sealed beneath the glacier. Estimates range from about 1.5 million years of isolation (for the microbes living in it) to a Pliocene origin about 5 million years ago. The brine is salty, iron-rich and has no detectable oxygen. When it reaches the air, dissolved ferrous iron oxidizes into iron-rich nanospheres that stain the ice red as the brine drops 60 to 80 feet to the lake shore. A 2017 radar survey traced a brine pathway more than 300 feet long inside the glacier, making Taylor the coldest known glacier with persistently flowing water.
• DD-726 Independence Day: July 4, 2026 was the 250th anniversary, or semiquincentennial, of the adoption of the Declaration of Independence. The Second Continental Congress voted for independence on July 2, 1776, by adopting the Lee Resolution with 12 colonies in favor and New York not voting. It adopted the Declaration's text on July 4, and John Dunlap printed the first copies that night. Contrary to popular belief, the engrossed parchment wasn't signed on July 4. Most delegates signed it on August 2, 1776, and 56 eventually did.
• DD-727 Anduril: Anduril Industries was incorporated on April 20, 2017, by Palmer Luckey (creator of the Oculus Rift), Trae Stephens, Matt Grimm, Joe Chen and Brian Schimpf (now CEO). It's based in Costa Mesa, California. Its Lattice software fuses data from Anduril's own and third-party sensors and is the core of its products, which range from Sentry surveillance towers used on the U.S.–Mexico border to Ghost and Altius drones, Roadrunner and Barracuda interceptors and missiles, Ghost Shark autonomous submarines and the Fury (YFQ-44A) collaborative combat aircraft, first flown on October 31, 2025. Unlike traditional contractors paid to develop to a Pentagon requirement, it builds products on its own money and then sells them. A $5 billion raise in May 2026 valued it at $61 billion, and 2025 revenue was reported at about $2.2 billion. It also has critics: the WSJ reported test setbacks, including a Navy exercise in which more than a dozen Lattice-controlled drone boats failed, and civil-liberties groups have criticized its border towers.
• DD-728 The Odyssey: The Odyssey is an ancient Greek epic poem in 24 books, traditionally attributed to Homer and generally dated to around the late 8th or early 7th century BCE. It follows Odysseus, king of Ithaca, on his ten-year return from the Trojan War: blinding the Cyclops Polyphemus, a year with the sorceress Circe, sailing past the Sirens tied to his mast, and finally reclaiming his home from his wife Penelope's suitors. Counting the war, he's away for twenty years. The Reel was posted on July 18, 2026, the day after Christopher Nolan's film adaptation opened in U.S. theaters.
• DD-729 Whale Milk: Baleen whale milk at mid-lactation is about 30-50% fat, 9-15% protein and only 40-53% water. Toothed whales and dolphins produce thinner milk, about 10-30% fat. Whales have no external nipples; their teats sit inside mammary slits, and the mother squirts milk into the calf's mouth. Its thickness keeps it from dispersing in seawater, and a blue whale calf can gain over 100 kg a day. The richest-milk record, though, belongs to seals such as the hooded seal, not whales.
• DD-730 Canadian Wildfires: Canada's 2023 wildfire season was the largest since national records began, burning about 15 million hectares (the widely reported 18.5 million was a preliminary operational figure). That's more than double the previous record of 6.7 million hectares in 1989 and roughly 4% of Canada's forest area. Lightning started 59% of the roughly 6,700 fires but accounted for 93% of the area burned. More than 200 communities were evacuated, and smoke degraded air quality in cities more than 1,000 km away, including on the U.S. east coast.
• DD-731 National NEO: In 1983, Matsushita Electric (now Panasonic) aired a TV ad for National 'Neo Hi-Top' batteries, titled 'Because the Building Is There' (そこにビルがあるからだ篇). A battery-powered toy firefighter climbs a long ladder up a 33-story building, about 140 m, and at the top puts out a cigarette butt with its hose. Tetsuo Hashimoto, the Hakuhodo creative director behind it, later explained that the first idea was rock climbing, and that a Panasonic staffer redrew the toy's original cat face as a firefighter. The ad is widely reported to have won a gold award at Cannes.
• DD-732 I'm Obsessed...: Obsession is an R-rated horror film written and directed by Curry Barker, released in U.S. theaters by Focus Features on May 15, 2026. Bear (Michael Johnston), a music-store worker, breaks a novelty 'One Wish Willow' to make his friend Nikki (Inde Navarrette) love him, and the wish turns her obsessive and dangerous. The Reel's 'love story' review is deliberately ironic. Critics praised the film, with 93% on Rotten Tomatoes and 77 on Metacritic, and Box Office Mojo lists a worldwide gross of about $522.8 million.
• DD-733 Iranian Missile Cities: Iran's Islamic Revolutionary Guard Corps (IRGC) has publicized underground 'missile cities' in state-released videos. In March 2025 it showed a large facility where Iranian media said missiles including Sejjil, Qadr-H and Kheibar Shekan were stored. Analysts at The War Zone noted that the munitions appeared to sit in open galleries with few blast doors. During the June 2025 Israel-Iran war, analysts at ISW reported that Israeli strikes destroyed launch sites and tunnel entrances at several missile bases. In November 2025, Iran's passive-defense chief said the underground infrastructure was largely intact. Many details can't be independently verified.
• DD-734 Volar eVTOL: Bellwether Industries, founded in London in 2019, is developing the Volar, a wingless lifting-body eVTOL with ducted fans hidden inside its body. In November 2021, a half-scale, remotely piloted two-seat prototype called Antelope made eight free flights in Dubai, up to about 4 m high and about 40 km/h. The company's targets for the final aircraft are 4 to 5 seats, a width of 3.2 m, about 220 km/h and a 600 kg maximum takeoff weight. In 2023 it announced a propulsion partnership with Schubeler for its next prototype, Oryx. None of these targets has been demonstrated at full scale.
• DD-735 CrabMaxxing: In northeastern China, especially around Panjin in Liaoning, farmers stock Chinese mitten crabs (Eriocheir sinensis) in rice paddies. Studies there report that the crabs help control weeds and some rice diseases. Fields can match or slightly exceed monoculture rice yields while using less fertilizer nitrogen, and the crabs are harvested as a second, valuable crop. Researchers have also studied how crab stocking density affects the yields of both rice and crabs.
• DD-736 Shoot-and-Scoot: The NORA-B52 is a 155 mm, 52-caliber self-propelled gun-howitzer made by Serbia's state-owned Yugoimport-SDPR, mounted on 8x8 truck chassis (KAMAZ and MAN). According to the manufacturer, ranges are 32.5 km with ERFB rounds, 41.5 km with base-bleed rounds and up to 52 km with V-LAP rounds, at up to 4 rounds per minute. The newest NG ('Perun') variant, shown in 2023, is operated from the cab and has a fully automatic loader holding 30 rounds plus 6 more on the vehicle. The M21 variant on a MAN chassis has 12 rounds in its autoloader, plus 24 stowed.
• DD-737 Elytra Lift: A ladybird's spotted elytra are hardened forewings. Its membranous hindwings do the flying and fold away beneath the elytra when not in use. In 2017, Kazuya Saito and colleagues at the University of Tokyo replaced one elytron of a seven-spot ladybird with a transparent artificial one to watch the folding. The beetle closes its elytra and then moves its abdomen repeatedly, while the elytron's edge and underside guide the wing along set fold lines. The process takes about two seconds. The wing's veins act like a tape spring, which helps it snap open for flight.
• DD-738 Hefei Fusion: On June 27, 2026, the Institute of Plasma Physics in Hefei (ASIPP) completed and accepted a toroidal field superconducting magnet for CRAFT, China's Comprehensive Research Facility for Fusion Technology. The magnet weighs 582.4 t, measures 21 × 12 × 3.3 m, operates at 98 kA and stores 120 GJ. Sixteen such coils would produce 6.5 T at the plasma center and a 14.5 T peak. ASIPP says it has 1.3 times the volume and three times the stored energy of an ITER TF magnet, making it the world's largest fusion-reactor superconducting magnet.
• DD-739 Branched Flow: Branched flow happens when waves pass through a weak, smoothly varying disorder whose features are larger than the wavelength. The waves form channels of higher intensity that keep dividing. It was first seen with electrons and microwaves. In 2020, Patsyk, Sivan, Segev and Bandres reported the first observation with light in Nature. They sent a laser into a soap film, which acts as a thin waveguide, and the film's smooth thickness variations focused the light into branching filaments that stayed unexpectedly collimated.
• DD-740 Kenny POWERs: The St. Lawrence 'Super Jump' was Canadian stuntman Ken Carter's project, begun in 1976, to jump a rocket-powered Lincoln Continental about a mile from near Morrisburg, Ontario to the United States. On September 26, 1979, after Carter's attempt was aborted, the backers and film producers had American stuntman Kenny Powers make the jump while Carter was away. The bumpy runway damaged the car, the parachutes deployed early, and it traveled about 506 feet before landing in shallow water. Powers survived with eight broken vertebrae, three broken ribs and a broken wrist. He died in 2009.
• DD-741 (Z) Pinch Me: In a Z-pinch, current flowing along the axis of a plasma or a metal target creates a circular (azimuthal) magnetic field, and the resulting Lorentz force drives the material inward. Sandia's Z machine stores up to 22 MJ and discharges it as a pulse of about 100 nanoseconds, with currents of about 26 million amps (up to about 30 MA). That gives magnetic pressures of about 100 Mbar at a 1 mm radius. On Z, the targets are usually wire arrays or metal liners that vaporize into plasma. The Reel's footage is credited to Zap Energy, a company developing a different, sheared-flow Z-pinch approach to fusion.
• DD-742 Rick Charls: In 1983, ABC's Wide World of Sports staged its last World Record High Dive at SeaWorld San Diego. To count, a dive had to include at least one somersault, and the diver had to leave the water without help. Five divers succeeded from 172 ft (52.4 m): Rick Charls, Rick Winters, Dana Kunze, Bruce Boccia and Mike Foley, and all five share credit for the record. Charls, from Cincinnati, was a collegiate All-American at Ohio University and the 1980 world tandem high-diving champion.
• DD-743 Happiness: Research by Kent Berridge and Morten Kringelbach separates 'wanting' (incentive motivation, in which dopamine plays a major part) from 'liking' (hedonic pleasure). Liking depends on small hedonic hotspots, such as parts of the nucleus accumbens and ventral pallidum, where opioid and endocannabinoid signals amplify pleasure. Raising dopamine can increase wanting without increasing liking. The researchers also distinguish moment-to-moment pleasure from broader happiness, which includes a sense of meaning.
• DD-744 Sadness: A 2020 multidisciplinary review describes sadness as a normal emotion with distributed brain correlates. These include the subgenual anterior cingulate cortex, the dorsal periaqueductal gray and changes in frontal activity, along with altered autonomic control of the heart. The review treats ordinary sadness and clinical depression as related but distinct. The Reel's specific neurotransmitter claims are simplifications that these sources don't directly support.
• DD-745 Anger: Neuroscience reviews describe reactive anger and aggression as driven by a threat system running from the amygdala through the hypothalamus to the periaqueductal gray (PAG). The prefrontal cortex, especially the ventromedial and orbital regions, helps appraise and regulate these responses, and reduced function there is associated with more reactive aggression. The bodily surge is the sympathetic fight-or-flight response: epinephrine raises heart rate and blood pressure and sends blood to the muscles.
• DD-746 Disgust: Imaging studies link the anterior insula to disgust. In one study, how strongly people felt disgust tracked anterior insula activity regardless of its form. The insula isn't disgust-specific, though: it represents the body's internal (interoceptive) state in many emotions. A 2022 meta-analysis found that 'core' disgust (contamination) and 'social' disgust (moral) engage different networks but share anterior insula and fusiform activity. Occipital, amygdala and prefrontal regions are involved too.
• DD-747 Surprise: The locus coeruleus (LC) is a small nucleus in the brainstem and the brain's main source of noradrenaline (norepinephrine). Brainstem fMRI studies show that deviant, behaviorally relevant stimuli produce brief bursts of LC activity, which spread arousal and attention signals widely through the brain. The LC isn't a surprise-only system, though. It also tracks task relevance and general arousal, and other neuromodulatory systems respond to surprise too.
• DD-748 Fear: When the amygdala perceives danger, it signals the hypothalamus. The hypothalamus activates the sympathetic nervous system, and the adrenal glands release epinephrine (adrenaline), raising heart rate, blood pressure and blood sugar. If the threat persists, the HPA axis takes over: CRH from the hypothalamus triggers ACTH from the pituitary, which prompts the adrenal cortex to release cortisol. The amygdala is central to fear of external threats, but a 2013 study showed that people without functioning amygdalae can still feel fear and panic triggered from inside the body.
• DD-749 SSRIs: SSRIs inhibit the serotonin transporter (SERT) on presynaptic neurons, so serotonin stays in the synaptic cleft longer. They act on SERT within hours, but the NHS says benefits commonly appear after 1 to 2 weeks and can take longer. The delay is thought to reflect slower adaptations in receptors and circuits, and the idea that low serotonin causes depression (the monoamine hypothesis) is a postulate rather than settled fact. Regulators warn about withdrawal symptoms when stopping, and about monitoring young people early in treatment. This case is general information, not medical advice.
• DD-750 Spray Foam Fun: Spray polyurethane foam is mixed on site from an isocyanate side (polymeric MDI) and a polyol blend containing catalysts, surfactants and fire retardants. Open-cell foam is blown mainly by water and expands about 150 times. Closed-cell foam is blown mainly by HFC-type agents and expands about 35 to 50 times, so the 'more than 100 times' claim applies only to open-cell foam. Both types seal air well. Both are combustible and usually need a thermal or ignition barrier, and installers must manage isocyanate exposure.
• DD-751 Salvadoran Salvation: El Salvador recorded 6,656 homicides in 2015, a rate of about 105 per 100,000 and among the highest in the world. The Attorney General's office reported 114 for 2024. Since March 2022 a state of exception has suspended some constitutional rights, and more than 83,000 people were detained by late 2024. The government credits the crackdown for the fall. Analysts say the official count now excludes some categories of deaths, and the IACHR and Amnesty International report arbitrary detentions and deaths in custody.
• DD-752 Cosmic Freezer: The coldest place in the universe isn't the void between galaxies. It's a dying star's breath, 5,000 light-years away, at 1 K (-272 °C).
• DD-753 Sweet Disaster: In 1919, a 25-foot wave of molasses tore through Boston at 35 mph and killed 21 people.
• DD-754 Temperature Tiles: The Space Shuttle's thermal protection system used about 24,300 tiles, mostly silica-fiber ceramic, to shield the orbiter during reentry. The highest-temperature tiles were rated for about 1,260 degrees Celsius, and because the material is largely empty space it conducts heat so poorly that a tile glowing hot in the middle can be held at the edges moments after leaving a furnace. The footage, credited to asgardia_space, shows a tile being heated and then held by hand.
• DD-755 Vertical Parking: Before the robot could fetch a bike in seconds, someone had to decide to bury the bike rack. Giken designed the ECO Cycle to end messy, illegal bike parking around busy train stations, under a simple idea: keep only a compact entrance booth on the sidewalk and put the parking underground. The bikes sit in racks arranged around a round shaft, with a rotating elevator in the middle, and the shaft is built to withstand a quake of Japanese seismic intensity 6-upper. The first unit opened at Kochi University of Technology in June 1998.
• DD-756 Munitions Management: Armed forces, including the U.S. military, accumulate excess, obsolete or unserviceable ammunition during long deployments. Because it can't be discarded like ordinary waste, it is handed to disposal specialists, explosive ordnance disposal technicians and ammunition specialists, who destroy it through controlled detonation or open burning. The footage, credited to Historic Vids, shows service members unpacking ammunition and a controlled detonation.
• DD-757 Dragon Drones: Dragon drones are drones, typically modified first-person-view (FPV) types, that release burning thermite over positions; Ukrainian forces used them in the Russo-Ukrainian war, and they were first widely documented in 2024. Thermite burns at temperatures above 2,200 degrees Celsius, producing showers of molten metal. The footage, credited to HowThingsWork_, shows a drone dropping burning thermite over a field and buildings.
• DD-758 Feeling Froggy?: The wood frog (Lithobates sylvaticus), found across North America from the American Midwest and southern Canada to Interior Alaska, can survive with about 65-70% of its body water frozen. While frozen it shows no heartbeat, breathing or circulation. It builds up urea before winter and floods its tissues with glucose from the liver when ice starts to form; both act as cryoprotectants that limit ice formation and cell shrinkage. When temperatures rise in spring, the frog thaws, its heart starts beating again, and normal functions resume. The footage, credited to Nat Geo Animals, shows wood frogs in water and a close-up of a frog's eye.