The DetailDepartment

Did You Know?

Fact-checked case files on history, tech, space, nature and more.

• Lithobates sylvaticus. DD-758
• North America, to Interior Alaska. DD-758
• He was born on March 6, 1991, in Los Angeles. DD-207
• He co-founded Odd Future in 2007. DD-207
• Modified FPV drones. DD-757
• Thermite. DD-757
• Excess ammunition. DD-756
• Be thrown away. DD-756
• Giken's ECO Cycle was designed to end messy, illegal bike parking around busy train stations. DD-755
• An ECO Cycle leaves only a compact entrance booth on the sidewalk; the parking is buried below it. DD-755
• About 24,300. DD-754
• Silica fiber. DD-754
• January 15, 1919: Around 12:40 PM, a 50-foot steel tank in Boston's North End split open. DD-753
• 2.3 million gallons: About 8.7 million liters of molasses flooded two city blocks within seconds. DD-753
• The Boomerang Nebula: A cloud of gas blown off by a dying star, about 5,000 light-years away in Centaurus. DD-752
• 1 Kelvin: That's -272 °C / -458 °F. Just one degree above absolute zero. DD-752
• Most of Whittier, Alaska's roughly 300 year-round residents live in Begich Towers, a single 14-story building. DD-008
• Begich Towers in Whittier, Alaska was built by the U.S. Army as Cold War barracks; locals moved in after the military left. DD-008
• Lunavity is a wearable drone that holds up part of the wearer's weight while they jump; its name is a nod to the Moon. DD-007
• Lunavity was built by students from Jun Rekimoto's lab at the University of Tokyo and unveiled in 2018. DD-007
• Freeze branding marks horses with extreme cold instead of fire, and the hair grows back white in the brand's shape. DD-006
• Freeze-branding irons are copper or brass and are chilled in liquid nitrogen (-196 °C / -320 °F) or a dry ice and alcohol bath. DD-006
• The smallest drops from modern inkjet printheads measure about 1–3 picoliters (trillionths of a liter). DD-005
• Inkjet drops typically leave the printhead at roughly 5–15 meters per second (about 14 m/s for HP's thermal heads). DD-005
• Asteroid hyalosis is a condition in which harmless calcium-lipid bodies float inside the eye. DD-001
• Asteroid hyalosis fills the eye's vitreous gel with tiny calcium-phosphate-lipid spheres that glitter like stars but rarely affect vision. DD-001
• El Salvador's homicide rate peaked at about 105 per 100,000 in 2015. DD-751
• The state of exception begun in March 2022 had been extended 33 times by December 2024. DD-751
• Open-cell spray foam expands about 150 times; closed-cell about 35 to 50 times. DD-750
• Open-cell foam is blown mainly by water; closed-cell mainly by HFC-type agents. DD-750
• SSRIs work by inhibiting the serotonin transporter, SERT. DD-749
• NHS guidance says SSRI benefits commonly start after 1 to 2 weeks. DD-749
• Cortisol comes from the adrenal cortex, the last step of the HPA chain. DD-748
• People with bilateral amygdala damage still felt fear when they inhaled carbon dioxide. DD-748
• The locus coeruleus is the brain's main source of noradrenaline. DD-747
• Noradrenaline and norepinephrine are the same molecule. DD-747
• Felt disgust correlated with anterior insula activity across disgust types. DD-746
• Core and social disgust share anterior insula and fusiform activity. DD-746
• Reactive anger runs through an amygdala, hypothalamus and periaqueductal gray threat circuit. DD-745
• Anger (an emotion) is distinct from aggression (a behavior). DD-745
• Sadness involves distributed circuits, including the subgenual anterior cingulate cortex. DD-744
• Sadness is a normal emotion distinct from clinical depression. DD-744
• Dopamine drives 'wanting' more than 'liking'. DD-743
• Opioid and endocannabinoid signals in small hotspots amplify pleasure. DD-743
• Five divers share credit for the 172 ft world record from 1983. DD-742
• Valid dives needed a somersault and an unassisted exit from the water. DD-742
• Sandia's Z machine runs at about 26 million amps per shot. DD-741
• Magnetic pressure on Z reaches about 100 Mbar at a 1 mm radius. DD-741
• Kenny Powers replaced Ken Carter at the last minute for the 1979 jump. DD-740
• The rocket Lincoln traveled about 506 feet, not the planned mile. DD-740
• Branched flow of light was first observed in 2020, in soap films. DD-739
• Branched flow was first seen with electrons. DD-739
• The Hefei TF magnet operates at 98 kA and stores 120 GJ. DD-738
• ASIPP says it has three times the stored energy of an ITER TF magnet. DD-738
• A ladybird folds its hindwings in about two seconds. DD-737
• The wing's veins act like a tape spring. DD-737
• The NORA-B52 NG's autoloader holds 30 rounds, with 6 more on the vehicle. DD-736
• Manufacturer-quoted range reaches 52 km with V-LAP ammunition. DD-736
• Rice-crab co-culture mainly uses the Chinese mitten crab. DD-735
• One analysis found about 16.5% less fertilizer nitrogen with slightly higher rice yield. DD-735
• The Volar has flown only as a half-scale, remotely piloted prototype. DD-734
• Its electric propulsion is ducted fans hidden in the body. DD-734
• Iran publicized a large underground missile facility in March 2025. DD-733
• Assessments of the 2025 damage differ between Israeli, analyst and Iranian sources. DD-733
• The 2026 World Humanoid Robot Games in Beijing drew 2,056 robots from 666 teams in 16 countries, about four times as many robots as the 2025 Games. DD-023
• At the 2026 World Humanoid Robot Games, a fully autonomous run in a scenario event scored double a remote-controlled one (1.0 vs 0.5). DD-023
• Panthalassa's Ocean-3 nodes are 85 m steel floating data centers that make their own power from waves and send AI results to shore by satellite. DD-022
• Ocean-3 nodes have no anchor and no shore cable. They are self-propelled, and their CEO compares them to a giant Roomba. DD-022
• A mortar fires when a round dropped down the muzzle hits a fixed firing pin at the base, which ignites the propellant charge in its tail. DD-021
• Conventional mortars fire only at high angles (above 45°), so they can hit targets behind hills or cover. DD-021
• The blue glow in nuclear reactor pools is Cherenkov radiation: electrons moving faster than light travels in water (about 75% of c). DD-020
• Cherenkov radiation is like a sonic boom for light, and IAEA inspectors use the glow to verify spent nuclear fuel. DD-020
• Namtso in Tibet sits 4,718 m (15,479 ft) above sea level, and its name means 'heavenly lake' in Tibetan. DD-019
• Namtso is often described as the world's highest-altitude saltwater lake. DD-019
• Intel's first microprocessor, the 4004 (1971), had 2,300 transistors. NVIDIA's GH100 chip has 80 billion on one 814 mm² die. DD-018
• Process names like '7 nm' are generation labels: a '7 nm' transistor's gate is actually about 15 nm long. DD-018
• Automatic mahjong tables use two sets of tiles: the machine shuffles and stacks one set inside while players use the other. DD-017
• Mahjong tiles for automatic tables contain magnets, so the machine can turn every tile face-down before stacking the walls. DD-017
• Terafab, SpaceX and Tesla's planned chip complex in Grimes County, Texas, would span 100 million square feet, with a first phase of more than $16.8 billion. DD-016
• Terafab's tax filings sketch four phases worth up to about $119 billion, but only the $16.8 billion first phase has been announced. DD-016
• Vaults are hollow, barrel-shaped particles in most of our cells (about 10,000 per cell), each built from 78 copies of one protein, and nobody knows for sure what they do. DD-015
• A vault weighs about 12.9 megadaltons and is made of two identical halves of 39 major vault proteins each. DD-015
• Obsession is a horror film by Curry Barker, released May 15, 2026. DD-732
• Box Office Mojo lists a worldwide gross of about $522.8 million. DD-732
• The 1983 National Neo Hi-Top ad sent a toy firefighter up a 33-story, roughly 140 m building. DD-731
• The toy's face was originally a cat's. DD-731
• Canada's 2023 fire season burned about 15 million hectares, more than double the 1989 record. DD-730
• Lightning-caused fires accounted for 93% of the area burned in 2023. DD-730
• Baleen whale milk is about 30-50% fat at mid-lactation. DD-729
• A blue whale calf can gain over 100 kg a day on its mother's milk. DD-729
• The Odyssey has 24 books and is traditionally attributed to Homer. DD-728
• Odysseus is away from Ithaca for twenty years: ten at war and ten traveling home. DD-728
• Anduril was founded in 2017 by a group that included Oculus Rift creator Palmer Luckey, and it's named after Aragorn's sword in The Lord of the Rings. DD-727
• Anduril's Lattice software fuses data from drones, radars and cameras into one picture, though a Navy test of Lattice-run drone boats left more than a dozen dead in the water. DD-727
• Congress voted for independence on July 2, 1776, and adopted the Declaration on July 4. DD-726
• Most delegates signed the parchment Declaration on August 2, 1776. DD-726
• Blood Falls is red because iron-rich, oxygen-free brine from beneath Taylor Glacier oxidizes the moment it meets the air. DD-725
• The brine stays liquid inside a glacier whose mean temperature is about -17 °C, because salt lowers its freezing point and freezing releases heat. DD-725
• Jongerius ecoduna's 1-hectare algae plant in Austria opened in 2018. DD-724
• ExxonMobil ended its algae biofuel program after about $350 million. DD-724
• JR East's power-generating floor at Tokyo Station turns passengers' footsteps into electricity using piezoelectric discs, about 600 per square meter. DD-014
• Footstep-power floors make only small amounts of energy. Tokyo Station's best day was about 940 kW·s, roughly a quarter of a kilowatt-hour. DD-014
• RLP (Rapid Liquid Printing), from MIT's Self-Assembly Lab, prints liquid rubber, foam or plastic inside a tank of gel instead of layer by layer in air. DD-013
• Rapid Liquid Printing can make a complex object in seconds to minutes, and objects up to the size of furniture. DD-013
• A superconducting quantum chip sits on the bottom plate of a dilution refrigerator at around 10–15 millikelvin, more than 180 times colder than deep space. DD-012
• Dilution refrigerators cool by pumping helium-3 across the boundary between two phases of a helium-3/helium-4 mixture, which only separates below about 0.87 K. DD-012
• Fattening farms feed about 10-20 kg of baitfish per kg of tuna weight gained. DD-723
• Daily rations are about 2-10% of the caged tuna biomass. DD-723
• Robotor's co-founder says the robots carve about 10 times faster than hand tools. DD-722
• Human artisans still hand-finish robot-carved statues. DD-722
• Alsomitra's winged seeds span about 13 cm, the largest winged seeds on record. DD-721
• The seed's shape inspired Igo Etrich's gliders and the Etrich Taube aircraft. DD-721
• No. 4014 traveled 1,031,205 miles before retiring in 1961. DD-720
• It returned to service in May 2019 after Union Pacific converted it to burn oil. DD-720
• The last of Kuwait's burning oil wells was capped on November 6, 1991. DD-719
• At their peak, the damaged wells released an estimated 4-6 million barrels of oil a day. DD-719
• Lake Mead fell to a record low of 1,037.43 ft on October 16, 2026, per Reclamation gauge data. DD-718
• The 1922 Colorado River Compact was based on unusually wet years. DD-718
• Flock Safety cameras record more than plates: a 'Vehicle Fingerprint' of make, color, damage and even bumper stickers. DD-030
• More than 80% of the 137,000-plus license-plate-reader cameras mapped in the U.S. by August 2026 were Flock's. DD-030
• Data centers used about 415 TWh of electricity in 2024, roughly 1.5% of the world's total, and the IEA expects that to more than double by 2030. DD-029
• Top AI chips now draw more than 1,000 watts each, which is why new data centers are switching to liquid cooling. DD-029
• Plitvice's lakes are held back by tufa barriers of calcium carbonate. DD-717
• Plitvice became Croatia's first national park on April 8, 1949. DD-717
• The Exoatmospheric Kill Vehicle carries no explosive. It destroys ballistic-missile warheads in space by colliding with them ('hit-to-kill'). DD-011
• The EKV rides a three-stage Ground-Based Interceptor rocket out of the atmosphere, then steers itself to the target with onboard sensors and thrusters. DD-011
• Bethlehem Steel's subsidiary McClintic-Marshall fabricated and erected the Golden Gate Bridge's 67,908 tons of structural steel. DD-010
• In World War II, Bethlehem Steel's 15 shipyards built 1,121 ships, more than any other builder. DD-010
• Giken's ECO Cycle stores about 200 bicycles in an underground silo beneath a booth the size of a parked car. DD-009
• A bike parked in an ECO Cycle comes back up in about 13–15 seconds on average after the owner taps an IC card. DD-009
• McKibben artificial muscles are inflatable bladders inside braided sleeves. DD-716
• Braid angle determines whether a pneumatic actuator contracts or extends. DD-716
• Open stomatal pores cover only about 5% of a leaf's surface. DD-715
• The drought hormone ABA makes stomata close. DD-715
• The film itself never states that it's set in 2026. DD-714
• Metropolis premiered in Berlin on January 10, 1927. DD-714
• Atomic Annie, the M65 280mm Atomic Cannon, is the only artillery piece ever to fire a nuclear shell. DD-004
• The M65 Atomic Cannon, nicknamed Atomic Annie, weighed 83 tons. DD-004
• Julius Erving won the first dunk contest, in 1976, with a free-throw-line dunk. DD-713
• Jordan won the NBA dunk contest in 1987 and 1988. DD-713
• Winds in a hurricane's eye usually stay under 15 mph (NOAA). DD-712
• Seas in the eye of a strong hurricane can be near their maximum height (NHC). DD-712
• The first air-to-air refueling took place on June 27, 1923, over San Diego. DD-711
• The US Air Force mainly uses the flying boom, while the Navy uses probe and drogue. DD-711
• Eukaryotic cells contain specialized organelles, each with its own job. DD-003
• In a eukaryotic cell, the nucleus holds the cell's DNA and controls gene expression. DD-003
• The Probe IV was a 1983 concept car built by Ford with the design house Ghia. DD-002
• Ford's 1983 Probe IV concept car had a drag coefficient of about 0.15. DD-002
• In the Marangoni effect, liquid flows from regions of low surface tension toward regions of high surface tension. It's why wine forms 'tears' on the glass. DD-024
• Traces of sulfur or oxygen can reverse the Marangoni flow in a weld pool, turning a wide, shallow weld into a narrow, deep one. DD-024
• Jack-up rigs lower their legs to the seafloor and lift their entire hull out of the water to drill, in seas up to about 450 ft deep. DD-033
• Modern drillships hold position over a well in up to 10,000 ft of water with computer-controlled thrusters instead of anchors. DD-033
• Guizhou's first gigawatt-scale solar base went live on December 29, 2023, on hills so eroded by 'rocky desertification' that crops had failed there. DD-032
• At Guanling, Guizhou, the solar arrays were laid out in the shape of an ichthyosaur, a prehistoric 'fish-dragon'. DD-032
• Saudi Arabia's The Line was pitched as a 170-km, 500-m-tall mirrored city for 9 million people, but it was suspended in 2025 after only about 2.4 km of foundations. DD-031
• In The Line's design, two residents would on average be 57 km apart. In a circular city of the same area they'd be just 2.9 km apart. DD-031
• Ford's A1B reactors give it about three times the electrical capacity of a Nimitz-class carrier (CRS). DD-710
• Ford was commissioned on July 22, 2017. DD-710
• Rosie was moved to Crystal World on February 21, 2019. DD-709
• Her formaldehyde was replaced with glycerol, a safer preservative. DD-709
• The B-52 first flew on April 15, 1952. DD-708
• The Air Force plans to keep the re-engined B-52J flying into the 2050s. DD-708
• Shangrao Lingshan's escalator line is reported at 1,236 m long. DD-707
• The Grand Buddha at Lingshan is in Wuxi, Jiangsu, not Shangrao. DD-707
• Ali Khamenei was Iran's president from 1981 to 1989 and its supreme leader from 1989 until he was killed on Feb. 28, 2026. DD-076
• His son Mojtaba Khamenei was named Iran's third supreme leader on March 8, 2026. DD-076
• Bokty's name is usually translated as 'pie' in Kazakh. DD-706
• Its white bands are chalk and its red bands are iron-rich. DD-706
• Heavy calcareous fouling can raise required shaft power by up to 86% (Schultz, 2007). DD-705
• The IMO revised its Biofouling Guidelines in July 2023. DD-705
• The White Temple's white plaster stands for the Buddha's purity, and its embedded mirror chips for the Buddha's wisdom. DD-042
• Artist Chalermchai Kositpipat began rebuilding Wat Rong Khun with his own money in 1997, and it isn't expected to be finished until about 2070. DD-042
• The B-1B's wings swing from 15° to 67.5°, shrinking its wingspan from 137 ft to 79 ft for high-speed flight. DD-036
• The B-1B was stripped of all nuclear capability by 2011 under New START, and Russian inspectors could verify it every year. DD-036
• Mexico's 'tilted town' at Xenses Park sits on a steep slope with houses built square to a false horizon, so your eyes and your inner ear disagree. DD-035
• In tilted-house illusions, vision usually beats the inner ear: the effect gets two to three times stronger when your body is tilted too. DD-035
• Harbin's ice palaces are cut from the frozen Songhua River in blocks two to three feet thick, and the whole Ice and Snow World is rebuilt every year. DD-034
• Harbin Ice and Snow World holds a Guinness record as the world's largest ice-and-snow theme park. DD-034
• Each caracal ear is moved by about 20 muscles, letting the two ears swivel independently. Humans have six ear muscles. DD-041
• The name 'caracal' comes from the Turkish for 'black ears', after its long black ear tufts. DD-041
• The Chronicle of Georgia's 16 pillars rise 30 to 35 meters above the Tbilisi Sea. It was begun in 1985 and is still technically unfinished. DD-028
• The hill under the Chronicle of Georgia was once reserved for a 100-meter statue of Stalin. DD-028
• Only one Lun-class ekranoplan, MD-160, was completed. DD-704
• It carried six P-270 Moskit anti-ship missiles. DD-704
• Only two of the three 'whales' can be reached on foot. DD-703
• The rock belongs to the Early Cretaceous Phu Phan Formation, according to a geology write-up. DD-703
• Each DSNY snow melter melts 60 to 120 tons of snow an hour. DD-702
• The water in the 'hot tubs' is kept at about 38 °F. DD-702
• At a standstill, a car's torque converter can multiply engine torque by about 2 to 2.5 times, thanks to a part called the stator. DD-075
• Most modern torque converters still contain a mechanical clutch, which locks up at cruising speed to stop fluid slip. DD-075
• The first Grass Skiing World Championships were held in 1979 in Virginia, not in Europe. DD-074
• The International Ski Federation (FIS) has governed grass skiing since 1985. DD-074
• The largest Greenland shark studied was estimated at 392 ± 120 years. DD-701
• Females are estimated to mature at about 156 years. DD-701
• A HYPERVSN fan spins four LED rays at about 670 rpm. DD-700
• 'Hologram fans' draw a flat image and aren't true holograms. DD-700
• A drone-placed robot first de-iced a ground wire in Shaoxing on January 20, 2026. DD-699
• Hubei's flying robot combined vibration with rotating blades. DD-699
• Perfectly pure water still conducts slightly (0.055 µS/cm at 25 °C), because a tiny fraction of its molecules split into ions. DD-073
• Weak acids such as acetic acid conduct far less than strong acids such as hydrochloric acid at the same concentration. DD-073
• The dipper is the only songbird family that hunts underwater. It walks down into fast streams and uses its wings as flippers. DD-040
• A white-throated dipper has about twice as many feathers as a blackbird, oiled by an unusually large preen gland. DD-040
• The glockenspiel has 30 Meissen porcelain bells. DD-698
• It doesn't play in frost, to protect the porcelain. DD-698
• Hangzhou's Qingshan Lake has a forest of about 10,000 cypress trees growing right out of the water, with roughly two meters of each trunk submerged. DD-027
• In summer, duckweed turns the lake under the trees bright green, earning it the nickname 'matcha forest'. DD-027
• Cannikin (1971) was the largest underground nuclear test in U.S. history, with a yield just under five megatons, set off more than a mile beneath Alaska's Amchitka Island. DD-026
• The protest voyage against Cannikin gave Greenpeace its name and founding mission. DD-026
• Only the Navy's newest carriers, the Ford class, use EMALS. Nimitz-class carriers still launch jets with steam catapults. DD-025
• EMALS stores launch energy in spinning generator rotors, then releases it in a pulse lasting a couple of seconds to a linear motor under the deck. DD-025
• Drop empty mass. DD-697
• Reach orbit. DD-697
• In most piston diaphragm pumps, the piston pushes hydraulic oil, and the oil flexes the diaphragm. DD-072
• In a piston diaphragm pump, only the chamber, the diaphragm and the check valves touch the pumped liquid. DD-072
• Groundwater declines accelerated over four decades in 30% of the world's regional aquifers studied in a 2024 Nature paper. DD-071
• When over-pumped clay layers compact, the aquifer permanently loses storage, even if water levels later recover. DD-071
• CO₂ rock blasting was conceived around 1924–25 by coal men in southern Illinois and sold under the name Cardox. DD-070
• A Cardox tube's rupture disc can be set to burst at pressures from about 1,200 to 2,800 bar. DD-070
• Kiwi shoe polish launched in Melbourne in 1906. DD-696
• Creams mainly nourish and recolor, and wax polishes mainly shine and protect. DD-696
• The ball's limit is 250 ft/s initial velocity plus a 2% tolerance. DD-695
• From 2028, conformance testing uses a 125 mph clubhead speed. DD-695
• Powder coating is held on by static electricity until a 325–450 °F oven melts and cross-links it into a hard finish. DD-051
• Because powder coating uses no solvents, it virtually eliminates VOC emissions, and overspray can be reused. DD-051
• On January 5, 2026, China's helium-lifted S2000 airborne turbine rose to 2,000 m and fed 385 kWh into the grid on its first flight. DD-050
• Wind power rises with the cube of wind speed, which is why engineers are trying to fly turbines into stronger winds. DD-050
• The Gulf of Mexico's 'Jacuzzi of Despair' is a lake on the seafloor, about 1,000 m down, four to five times saltier than the ocean around it. DD-049
• Animals that stray into seafloor brine pools die from the salt, low oxygen and toxic gases, and their bodies are preserved along the rim. DD-049
• Head et al. (2009) estimated Titanoboa at about 13 m and 1,135 kg. DD-694
• Vasuki indicus, described in 2024, may rival Titanoboa in length. DD-694
• The Chicxulub crater is buried under about 1 km of sediment. DD-693
• A 2024 study found the impactor was a carbonaceous asteroid, not a comet. DD-693
• In one Etosha study, 71% of hyena deaths were caused by lions. DD-692
• Spotted hyenas kill most of the food they eat. DD-692
• The Magyars brought the Puli to Hungary more than a thousand years ago to herd sheep. DD-691
• The Komondor is a white-only livestock guardian, much larger than the Puli. DD-691
• The arch's inscription honors Titus as 'divus', after his death and deification. DD-690
• The south relief shows the menorah carried among the Temple's spoils. DD-690
• In a peristaltic pump, the fluid touches only the inside of the tube. DD-689
• Peristaltic pump flow naturally pulses as rollers lift off the tube. DD-689
• Chambord's construction officially began on September 6, 1519, four months after Leonardo died. DD-688
• The two flights of Chambord's staircase wind around a hollow core and never meet. DD-688
• A crane tips when the overturning moment exceeds the stabilizing moment. DD-687
• Too much counterweight can tip a crane backward when it's unloaded. DD-687
• Luxor's elevators, called inclinators, run at a 39-degree angle. DD-686
• The pyramid opened with 2,526 rooms on October 15, 1993. DD-686
• The gaur belongs to the cattle genus Bos, not the bison genus Bison. DD-685
• India holds about 85% of the world's gaur. DD-685
• The arapaima must surface to breathe air roughly every 5-15 minutes. DD-684
• FishBase lists maximum reports of 4.5 m and 200 kg. DD-684
• Wild green turtles take five to seven breaths after a resting dive. DD-683
• Fitzroy River turtle dives reached up to 623 minutes. DD-683
• One Incense Pillar is about 150 m tall and 4 m wide at its narrowest. DD-682
• It's made of horizontally bedded Triassic limestone. DD-682
• After leaving the den, bears stay in 'walking hibernation' for about 2-3 weeks. DD-681
• Black bears cut metabolism to about 25% while lowering body temperature only about 5-6 °C. DD-681
• Katakai's yonshakudama weighs about 420 kg. DD-680
• The Guinness record shell (2014, Kounosu) weighed 464.826 kg. DD-680
• Hayes's 2002 study reported effects in frogs at 0.1 parts per billion of atrazine. DD-679
• The EPA's 2007 review found no consistent, reproducible gonadal effects. DD-679
• ATL handled about 106.3 million passengers in 2025. DD-678
• Chicago O'Hare had the most aircraft movements in 2025. DD-678
• The FDNY inspects hydrants twice a year, in spring and fall. DD-677
• In New York City, hydrant flow tests are carried out by DEP. DD-677
• The XB-70 Valkyrie was designed to cruise at Mach 3 and 70,000 ft. Only two were built, and neither ever carried a bomb. DD-048
• The XB-70 used its own shock wave for lift, folding its wingtips down by up to 65° to help trap it. DD-048
• CIPP was first used in London in 1971. DD-676
• Steam-cured CIPP sites can release chemical vapors such as styrene (Purdue, 2017). DD-676
• The Mandelbulb, a 3D cousin of the Mandelbrot set, was found by fractal hobbyists Daniel White and Paul Nylander in 2009. DD-047
• There's no true 3D Mandelbrot set, because no three-dimensional number system works like the complex numbers. DD-047
• Siwa has roughly 200 natural springs. DD-675
• Siwa's salt lakes grew from about 23 km² in 1990 to about 61 km² in 2020. DD-675
• The ADL was founded in 1913 by B'nai B'rith, with Sigmund Livingston as its first leader. DD-674
• The ADL became independent of B'nai B'rith in 2009. DD-674
• About 220,000 people in Hong Kong live in subdivided flats. The median unit is 11 m², and 'coffin' cubicles are roughly the size of a single bed. DD-046
• Per square foot, Hong Kong's coffin homes rent for about four times the rate of private flats. DD-046
• Nineteen Eighty-Four was published on June 8, 1949, and Orwell died seven months later. DD-045
• Winston Smith's job at the Ministry of Truth is rewriting old newspapers. The originals go down 'memory holes' to a furnace. DD-045
• The Western Wall is part of the retaining wall Herod built around the Temple Mount. DD-673
• Herod's Temple Mount expansion began around 19 BCE. DD-673
• Charlie Kirk co-founded Turning Point USA in 2012, at age 18. DD-672
• Kirk was born on October 14, 1993, in Arlington Heights, Illinois. DD-672
• Oracle's name comes from a CIA-funded project code-named ORACLE that its founders had worked on at Ampex. DD-069
• Ellison stepped down as Oracle's CEO in 2014 but remains its executive chairman and CTO. DD-069
• Maduro, a former Caracas bus driver and union representative, became Venezuela's president after Hugo Chávez died in 2013. DD-068
• Since his capture by U.S. forces in January 2026, Maduro has been held in New York and has pleaded not guilty to federal charges. DD-068
• The oldest known gyotaku is dated to 1839. DD-671
• Gyotaku has direct and indirect methods. DD-671
• The diving bell works like a physical gill. DD-670
• The spider can stay underwater for more than a day. DD-670
• Iron's Curie temperature is about 770 °C. DD-669
• Pierre Curie published his findings in 1895. DD-669
• Banna stilts can be about three meters tall. DD-668
• The Banna share a language with the Hamar. DD-668
• EPFL and Canon's MegaX, unveiled in 2020, was the first megapixel camera made of single-photon avalanche diodes. DD-067
• MegaX records up to 24,000 frames per second; trillion-frame-per-second results came from MIT (2011) and Caltech (2018). DD-067
• If New York lost power, its subway pumps would stop and the tunnels would flood within days. DD-066
• In Pripyat, abandoned since 1986, trees are regenerating along streets and wildlife populations are abundant. DD-066
• GOV.UK Wallet was announced on January 21, 2025. DD-667
• The national digital ID programme was cancelled on July 21, 2026. DD-667
• A kangina is a sealed pair of mud-and-straw bowls. DD-666
• Kangina grapes can stay fresh for up to about six months. DD-666
• A walking floor moves the load while two-thirds of the slats hold still. DD-665
• KEITH introduced its WALKING FLOOR system in 1973. DD-665
• Half-moons are open to the uphill side, so they catch runoff. DD-664
• More than 50,000 water bunds have been reported dug in Arusha and Manyara. DD-664
• Guinness certified 'A Boy and His Atom' as the smallest stop-motion film. DD-663
• The film has 242 frames, each 45 by 25 nanometers. DD-663
• Trapped air cuts a fire-ant raft's average density by about 75%. DD-662
• Fire ants grip each other jaw-to-leg and leg-to-leg to form rafts. DD-662
• Baku. DD-661
• 2010. DD-661
• BAPS Swaminarayan Akshardham was dedicated on October 8, 2023. DD-660
• About 12,500 volunteers took part in building it. DD-660
• The Tree of Prosperity is about 11 m (38 ft) tall. DD-659
• Its 98,000 leaves are 24-karat gold leaf and brass leaf. DD-659
• The Shiziguan floating bridge opened in 2016. DD-658
• The official investigation lists the bridge at 318 m long and 4.5 m wide. DD-658
• NASA Spinoff reported aeroponics using up to 98% less water than soil growing. DD-657
• Bowery Farming shut down in November 2024. DD-657
• In Saudi Arabia, high-speed drifting is called tafheet. DD-656
• Saudi drifting fines can reach SR60,000. DD-656
• Muslims around the world face the Kaaba in prayer: it's the qibla. DD-655
• During tawaf, pilgrims walk around the Kaaba seven times counterclockwise. DD-655
• Photons have no mass but carry momentum, so a mirror-like sail gets pushed twice: once when light hits it and again when it bounces off. DD-039
• LightSail 2's sunlight push was only about 0.058 mm/s², but after a month that adds up to about 550 km/h. DD-039
• Zinc oxide and titanium dioxide reflect only about 4-5% of UV. DD-654
• UV imaging showed sunscreen was missed on about 14% of the eyelid region. DD-654
• Each starling in a murmuration tracks about six or seven nearest neighbors. DD-653
• Murmurations get bigger and last longer when predators are around. DD-653
• McCandless flew about 320 ft from Challenger on February 7, 1984. DD-652
• The MMU last flew in November 1984, on STS-51A. DD-652
• A primary rainbow forms about 42° from the antisolar point. DD-651
• From aircraft, rainbows can appear as full circles. DD-651
• Concertina climbers grip before letting go. DD-650
• Brown tree snakes can climb poles using lasso locomotion. DD-650
• Malpighi described capillaries in 1661. DD-649
• Two-photon microscopy images deeper into living tissue. DD-649
• Solar prominences are cool, dense loops of plasma held up in the sun's hot corona by twisted magnetic fields. Stable ones can last for months. DD-038
• When a prominence erupts it becomes the bright core of a coronal mass ejection, which can reach Earth in as little as 15 to 18 hours. DD-038
• Body hair helped people detect bed bugs. DD-648
• Skin odor strongly affects mosquito attraction. DD-648
• The Kazotsky Kick taunt arrived on July 2, 2015. DD-647
• The squat-kick step is called the prisyadka. DD-647
• Vinicunca rises to about 5,036 m. DD-646
• Its sediments are about 65 to 2 million years old. DD-646
• Fissure eruptions are mostly effusive. DD-645
• Laki's fissure system is about 27 km long. DD-645
• Venice's water ambulances are run by SUEM 118. DD-644
• The service handles about 18,000 call-outs a year. DD-644
• Three Gorges has 22,500 MW of installed capacity. DD-643
• It generated a record 111.8 TWh in 2020. DD-643
• EPA banned methylene chloride in consumer paint strippers in 2019. DD-642
• EPA's 2024 rule bans most uses of methylene chloride. DD-642
• No bdelloid males have ever been found. DD-641
• A bdelloid revived from 24,000-year-old permafrost. DD-641
• Photoinitiators turn UV light into reactive species. DD-640
• Cationic UV coatings can keep curing in the dark. DD-640
• Bagger 293 weighs about 14,200 tonnes. DD-639
• It can move 240,000 m³ of earth a day. DD-639
• The Tesla Diner opened on July 21, 2025. DD-638
• It has 80 V4 Supercharger stalls. DD-638
• Baumgartner jumped from 38,969.4 m on October 14, 2012. DD-637
• He reached 1,357.6 km/h, Mach 1.25, in freefall. DD-637
• Hunga Tonga's 2022 plume reached about 57 km. DD-636
• Eyjafjallajökull's 2010 ash led to more than 100,000 cancelled flights. DD-636
• The human brain has about 86 billion neurons. DD-635
• About 69 billion neurons are in the cerebellum. DD-635
• Long, narrow. DD-634
• Water vapor. DD-634
• Mohammad Reza Pahlavi left Iran in January 1979 but never formally abdicated. DD-065
• Women in Iran first voted in a parliamentary election on Sept. 17, 1963, after the White Revolution reforms. DD-065
• Hailstones grow by catching supercooled water drops. DD-633
• The largest U.S. hailstone was 8.0 inches across. DD-633
• U.S. reef plans judge materials on function, compatibility, durability and stability. DD-632
• Artificial reefs' benefits depend heavily on location and design. DD-632
• Fans keep air-supported construction domes inflated. DD-631
• A Guangzhou dome is reported to block up to 99% of dust. DD-631
• Guttation droplets from some Penicillium molds hold far more ochratoxin A than the mycelium that produces them, up to 11 times more. DD-064
• Toxigenic black mold (Stachybotrys chartarum) can produce guttation droplets laden with satratoxins. DD-064
• A HYPERVSN Solo M fan has 672 LEDs on four rays. DD-630
• Holography was invented by Dennis Gabor in 1947. DD-630
• Ospreys can turn their outer toe backward. DD-629
• Ospreys catch fish on at least 1 dive in 4. DD-629
• Blue T. insularis are a color morph, not a subspecies. DD-628
• The blue morph is reported from Komodo and Padar. DD-628
• Trident II D5 was first deployed in 1990. DD-627
• The UK draws its Trident missiles from a shared pool in Georgia. DD-627
• Replacing a chip on a board is called rework. DD-626
• Ball grid array chips have no pins, only hidden solder balls. DD-626
• Pipeline blasting mostly breaks bedrock for the trench. DD-625
• Blasting plans call for pre-blast surveys within 150 ft. DD-625
• Tigers can leave claw marks more than 3 m up a tree. DD-624
• Sprayed marking fluid is a tiger's best-documented scent mark. DD-624
• Cloud-chamber tracks are droplets condensed on ions. DD-623
• C.T.R. Wilson built the first cloud chamber in 1911. DD-623
• All US paper currency is printed in Washington, D.C., and Fort Worth, Texas. DD-622
• The Federal Reserve Board sends the BEP an annual print order. DD-622
• Raytheon was founded in 1922 as the American Appliance Company. DD-621
• RTX reported Raytheon's 2024 net sales at $26.7 billion. DD-621
• The Safavid dynasty is named after Sheikh Safi al-Din Ardabili. DD-620
• The Sheikh Safi al-Din shrine ensemble became a UNESCO World Heritage Site in 2010. DD-620
• Water in the Everglades flows south at about half a mile a day. DD-619
• The NPS calls the American alligator a keystone species of the Everglades. DD-619
• Hendrik Casimir predicted the Casimir force in 1948. DD-618
• The dynamical Casimir effect was first observed in 2011 in a superconducting circuit. DD-618
• Mercedes-Benz Stadium opened on August 26, 2017. DD-617
• Mercedes-Benz Stadium was the first professional sports stadium to earn LEED Platinum certification. DD-617
• Nitinol is named for nickel, titanium and the Naval Ordnance Laboratory. DD-616
• A nitinol part's remembered shape is set by heat-treating it at about 500 °C. DD-616
• Macrophages ('big eaters') swallow bacteria whole and digest them in an acidic compartment that can reach about pH 4.5. DD-044
• Élie Metchnikoff discovered phagocytosis in 1882 by sticking a rose thorn into a starfish larva, and shared the 1908 Nobel Prize. DD-044
• More than 200 climbers' bodies are thought to remain on Everest, mostly because recovering them above 8,000 m is so dangerous and costly. DD-063
• Nepal's clean-up campaigns since 2019 have brought 14 bodies down, including four bodies and a skeleton in 2024. DD-063
• The Space Shuttle orbiter landed unpowered, as a glider. DD-615
• 78 of the Space Shuttle's 133 landings were at Kennedy Space Center. DD-615
• Disney Research's Blue appeared at NVIDIA's GTC 2025 keynote. DD-614
• Newton physics engine was released in beta under the Linux Foundation in September 2025. DD-614
• Sickle hemoglobin forms rigid strands when it releases oxygen. DD-613
• Sickle cells last only 10 to 20 days, compared with 90 to 120 for normal red cells. DD-613
• A supercell's rotating updraft is called a mesocyclone. DD-612
• Supercells typically last 2–4 hours. DD-612
• Palantir went public in 2020 through a direct listing on the New York Stock Exchange, not a traditional IPO. DD-062
• Palantir's early funding included In-Q-Tel, the CIA's venture capital arm. DD-062
• Self-reconfigurable modular robots trace back to Toshio Fukuda's CEBOT ('cellular robot') in the late 1980s. DD-061
• GITAI's Inchworm robots and Lunar Rover built and then took apart a 5-meter tower in a desert simulating the Moon. DD-061
• Golden eagles drop tortoises onto rocks to break their shells. DD-611
• Tortoises made up about 71% of golden eagles' breeding-season diet in northern Greece. DD-611
• Photochemical ignition happens when light splits molecules directly. DD-610
• Engine laser ignition systems typically use near-infrared Nd:YAG lasers to make a plasma spark. DD-610
• The Lunar Roving Vehicle was first driven on the Moon on July 31, 1971. DD-609
• The Lunar Roving Vehicle had a mass of 210 kg and could carry 490 kg. DD-609
• The first floating solar system was built in Aichi, Japan, in 2007. DD-608
• Floating solar platforms are anchored to the bank, the bottom or piles. DD-608
• Mount Kailash has no recorded ascent. DD-607
• Mount Kailash is sacred in Hinduism, Buddhism, Jainism and Bon. DD-607
• Iron Dome was declared operational on March 27, 2011. DD-606
• Iron Dome only fires at rockets predicted to hit protected areas. DD-606
• The Kailasa temple at Ellora was carved downward out of a single basalt cliff. DD-605
• UNESCO calls the Kailasa temple the largest monolithic temple at Ellora. DD-605
• Northrop Grumman began as Northrop Aircraft in 1939. DD-604
• Northrop Grumman built the Webb telescope's sunshield. DD-604
• Constellations look the same from Mars as from Earth. DD-603
• Mars has no bright North Star. DD-603
• The Alcubierre drive is a 1994 mathematical solution to Einstein's equations; no warp drive has ever been built or tested. DD-060
• It needs negative energy density, and early estimates put the requirement beyond the mass-energy of the visible universe. DD-060
• Sheep scab is caused by the mite Psoroptes ovis. DD-602
• Organophosphate sheep dips only work as a full plunge dip. DD-602
• Ballistic missile warheads also exceed Mach 5. A hypersonic glide vehicle's distinction is that it can maneuver. DD-059
• Hypersonic missiles can face sustained temperatures as high as 3,000 °F, according to the Congressional Budget Office. DD-059
• Stars are born in molecular clouds as cold as 10 to 20 K, which must be squeezed by a factor of nearly 10^20 in density to make a star. DD-037
• A protostar becomes a true star only when its core reaches about 10 million K and hydrogen fusion begins. DD-037
• A tapered soft arm bends more flexibly than a cylindrical one. DD-601
• The 2020 octopus gripper runs on just two valves. DD-601
• Kawah Ijen's blue glow is burning sulfur, not lava. DD-600
• Ijen's sulfur miners carry loads of about 75 to 90 kg. DD-600
• Grey-headed albatross chicks peak heavier than their parents. DD-599
• Grey-headed albatrosses usually breed every other year. DD-599
• Snake venom metalloproteinases break down capillary walls. DD-598
• Venom can clot blood and then leave it unable to clot. DD-598
• Sclerotherapy closes veins by damaging their lining. DD-597
• Polidocanol is a detergent-type sclerosant. DD-597
• Most pulsars spin a few times a second or slower; only millisecond pulsars, spun up by companion stars, reach hundreds of spins a second. DD-058
• The fastest known pulsar, PSR J1748-2446ad, spins 716 times a second. DD-058
• Chordodes formosanus was described in 2011. DD-596
• A related worm carries many mantis-derived genes. DD-596
• Combustion. DD-595
• Above 3,000 C, per the Reel. DD-595
• The B-2 test stand at Stennis can receive 335,000 gallons of water a minute. DD-594
• A typical 500-second RS-25 test at Stennis uses about 5 million gallons of water. DD-594
• UT Austin's 'smart plastic' turns hard where blue light hits it and stays soft where it doesn't, because light controls which catalyst builds the polymer. DD-057
• The light-hardened regions are about 300 times stiffer than the soft ones, yet both are the same polymer. DD-057
• Air-filled organs like the lungs are the body's most vulnerable parts to blast and pressure injury. DD-593
• Ocean pressure rises by about one atmosphere for every 10 meters of seawater. DD-593
• Duga-1 operated from July 1976 to December 1989. DD-592
• Shortwave listeners nicknamed Duga the Russian Woodpecker for its tapping signal. DD-592
• Parrotfish grind swallowed reef material with a pharyngeal mill in the throat. DD-591
• Parrotfish can produce hundreds of pounds of sand a year. DD-591
• The Motherland Calls reaches 85 meters (279 feet) from the pedestal base to the sword tip. DD-590
• The memorial was dedicated on October 15, 1967. DD-590
• In a microwave, electric fields concentrate at sharp points and edges of metal. DD-589
• The USDA says to keep shielding foil at least an inch from the oven walls. DD-589
• GFP doesn't make light itself; it turns aequorin's blue light green. DD-056
• The crystal jelly is a hydrozoan, not a true jellyfish. DD-056
• The number of paths to each bin of a Galton board follows Pascal's triangle. DD-588
• Francis Galton designed his board for a Royal Institution discourse in 1874. DD-588
• In obligate siblicide, one chick almost always kills the other. DD-587
• The insurance egg hypothesis says a second egg is a backup in case the first fails. DD-587
• Pulse jet. DD-586
• Rapid pulses. DD-586
• A trocar and cannula are used to relieve free-gas bloat. DD-585
• Rumen gas is mostly carbon dioxide, with methane second. DD-585
• Dallol's springs have measured pH values as low as about -1.7. DD-055
• Most of the Danakil Depression lies about 100 m below sea level, reaching around 124 m. DD-055
• The HZ-1 Aerocycle was steered by the pilot shifting his weight. DD-584
• The Aerocycle's first free flight was in January 1955 at the Brooklyn Army Terminal. DD-584
• Forced silking mainly draws major ampullate (dragline) silk. DD-583
• The V&A's golden spider-silk cape used the silk of 1.2 million golden orb-weavers. DD-583
• Starbase voters approved incorporation 212 to 6 on May 3, 2025. DD-582
• Cameron County certified Starbase as a city on May 20, 2025. DD-582
• In an impact sprinkler, a spring-loaded arm knocked aside by the jet strikes the body and turns the head in small steps. DD-581
• Orton Englehart's impact sprinkler patent was granted on April 16, 1935. DD-581
• The tripod fish's fin rays can reach about a meter, roughly three times its body length. DD-580
• Bathypterois grallator lives at depths of about 878 to 4,720 m. DD-580
• Ural's two RITM-200 reactors power three 20-megawatt propeller motors. DD-579
• Ural is designed to break level ice 2.8 m thick. DD-579
• Ceres is about 939 km across and holds about 40% of the asteroid belt's mass. DD-578
• Ceres has been classified as a dwarf planet since August 24, 2006. DD-578
• The Berlin Heart EXCOR's blood pumps sit outside the body and are driven by air pressure. DD-577
• The FDA approved the Berlin Heart EXCOR Pediatric on December 16, 2011. DD-577
• 2D axisymmetric simulations can't sustain a black hole disk's magnetic field on their own, because of Cowling's anti-dynamo theorem. DD-054
• Tilted accretion disks break axisymmetry and have to be simulated in full 3D. DD-054
• The Ayam Cemani's black color comes from fibromelanosis, a duplication involving the EDN3 gene. DD-576
• Ayam Cemani blood is red. DD-576
• Maslenitsa is held in the last week before Orthodox Great Lent. DD-575
• Maslenitsa ends on Forgiveness Sunday with the burning of a straw Lady Maslenitsa. DD-575
• Twilight. DD-574
• Below horizon. DD-574
• The Buzludzha monument opened on August 23, 1981. DD-573
• Work on a new roof and windows for Buzludzha officially began in August 2026. DD-573
• The Battle of Didgori was fought on August 12, 1121. DD-572
• The Didgori memorial was designed by Merab Berdzenishvili and Tamaz Gabunia. DD-572
• Up to 10,000 forced laborers built Bunker Valentin. DD-571
• No submarine was ever built in Bunker Valentin. DD-571
• The Buran orbiter made one uncrewed flight, on November 15, 1988. DD-570
• Russia leases Baikonur from Kazakhstan until 2050. DD-570
• China banned feeding food waste to pigs after African swine fever spread in 2018. DD-569
• China's Anti-Food Waste Law was adopted on April 29, 2021. DD-569
• Concorde entered scheduled service on January 21, 1976. DD-568
• Only 20 Concordes were built. DD-568
• Hallgrímskirkja was consecrated on October 26, 1986, 41 years after construction began. DD-567
• Hallgrímskirkja's Klais organ has 5,275 pipes. DD-567
• Edger. DD-566
• Frame shape. DD-566
• Virgin signed the Sex Pistols in 1977, but the Rolling Stones didn't sign with Virgin until 1991. DD-053
• Richard Branson flew to the edge of space on Virgin Galactic's Unity 22 flight on July 11, 2021. DD-053
• 1955, Seattle. DD-565
• Microsoft co-founder. DD-565
• 1945, Tel Aviv. DD-564
• Microbiology, medicine. DD-564
• Chewed wood fiber. DD-563
• Saliva. DD-563
• Visakhapatnam. DD-562
• Andhra Pradesh. DD-562
• Loose rock, debris. DD-561
• Fluid-like. DD-561
• Florida, Sept. 26, 2024. DD-560
• Western North Carolina. DD-560
• Rotary motor. DD-559
• Proton or sodium flow. DD-559
• OTO Melara (Leonardo). DD-558
• 76 mm. DD-558
• Carbon Robotics. DD-557
• Lasers. DD-557
• 1964, Albuquerque. DD-556
• Princeton, 1986. DD-556
• July 9, 1971. DD-555
• Graphical browser. DD-555
• 1967, Frankfurt. DD-554
• Co-founder, CEO. DD-554
• Boston Dynamics. DD-553
• Four. DD-553
• Boston Dynamics. DD-552
• Humanoid. DD-552
• Curled backward. DD-551
• Inertia. DD-551
• Submarine eruptions. DD-550
• Rapid in water. DD-550
• Microsurgery. DD-549
• Real-time. DD-549
• Different lengths. DD-548
• Depends on length. DD-548
• Corallus caninus. DD-547
• South America. DD-547
• About 93 billion ly. DD-546
• 13.8 billion years. DD-546
• Tesla. DD-545
• 2021. DD-545
• Moon's gravity. DD-544
• Two. DD-544
• Lift, pitch, roll, yaw. DD-543
• Pressurized. DD-543
• Binary neutron stars. DD-542
• Gravitational waves. DD-542
• 1969-1972. DD-541
• About 1/6 of Earth's. DD-541
• A nuclear fireball's weapon residues reach several tens of millions of degrees. DD-052
• Roughly 50% blast, 35% thermal and 15% nuclear radiation for a low-altitude fission burst. DD-052
• For entering zones. DD-540
• Less traffic. DD-540
• Health and human services. DD-539
• 1953, HEW. DD-539
• Tax on imports. DD-538
• Revenue, protection. DD-538
• NIAID director. DD-537
• 1984-2022. DD-537
• 2004, Harvard. DD-536
• Meta Platforms. DD-536
• Hungarian-American. DD-535
• Quantum Fund. DD-535
• Worldwide. DD-534
• Perch and dive. DD-534
• About 2.1 m. DD-533
• Over 600 kg. DD-533
• In-run, take-off, flight, landing. DD-532
• Measured precisely. DD-532
• Sunflower seeds. DD-531
• Screw press. DD-531
• Servo, stepper, BLDC. DD-530
• Microcontrollers. DD-530
• SpaceX. DD-529
• Low Earth orbit. DD-529
• 2016. DD-528
• Elon Musk. DD-528
• 2016. DD-527
• Implantable chip. DD-527
• Remove heat. DD-526
• More surface. DD-526
• Vasoconstriction. DD-525
• Autonomic nerves. DD-525
• Induction coil. DD-524
• High-frequency AC. DD-524
• Programmed death. DD-523
• Necrosis. DD-523
• 2002. DD-522
• Elon Musk. DD-522
• January 20, 2025. DD-521
• Renamed U.S. Digital Service. DD-521
• 2003. DD-520
• Eberhard, Tarpenning. DD-520
• 2019. DD-519
• Tom Holland. DD-519
• 2019. DD-518
• 11 years of films. DD-518
• 2019. DD-517
• Brie Larson. DD-517
• 2018. DD-516
• Paul Rudd. DD-516
• 2018. DD-515
• Thanos. DD-515
• 2018. DD-514
• Chadwick Boseman. DD-514
• 2017. DD-513
• Taika Waititi. DD-513
• 2017. DD-512
• Tom Holland. DD-512
• 2017. DD-511
• Kurt Russell. DD-511
• 2016. DD-510
• Benedict Cumberbatch. DD-510
• 2016. DD-509
• Opens Phase Three. DD-509
• Dawn Aerospace. DD-508
• Horizontal, runway. DD-508
• Early to mid-1900s. DD-507
• Montgomery Ward, among others. DD-507
• Huangluo, Guangxi. DD-506
• Red Yao. DD-506
• Killing male chicks. DD-505
• No eggs, poor meat yield. DD-505
• Rising heat. DD-504
• Wind shear. DD-504
• Equator. DD-503
• Past 22,236 mi. DD-503
• Water-based foam culls poultry by blocking their airways. It was conditionally approved in the U.S. in 2006 after the 2004 Delmarva bird flu outbreak. DD-043
• The AVMA's 2026 depopulation guidelines rank water-based foam below whole-house gassing, as a method permitted only in constrained circumstances. DD-043
• Motion detection. DD-502
• Rods dominate the periphery. DD-502
• About 35,000 km. DD-501
• Separated. DD-501
• Spaceship Neptune. DD-500
• Hydrogen balloon. DD-500
• Teardrop flames. DD-499
• Hot air rises. DD-499
• 1962. DD-498
• Robert Truax, Aerojet. DD-498
• First plunge. DD-497
• Hesitation. DD-497
• 1958-1965. DD-496
• General Atomics. DD-496
• Accretion disk. DD-495
• Friction. DD-495
• Extend pavement life. DD-494
• Clean and repair. DD-494
• Andean, California. DD-493
• Up to about 3 m. DD-493
• Molding, spin casting, lathing. DD-492
• Rigid gas permeable. DD-492
• Brumation. DD-491
• Slows. DD-491
• Brightest night star. DD-490
• 8.6 light-years. DD-490
• IoT, AI, data. DD-489
• Adaptive signals. DD-489
• Federal, within DHS. DD-488
• 2003. DD-488
• Medical assistance in dying. DD-487
• Canada, Belgium, Netherlands, some U.S. states. DD-487
• U.S., Mexico, Cuba. DD-486
• About 615,000 sq mi. DD-486
• Automated parking system (APS). DD-485
• Lifts and robotic platforms. DD-485
• Strongly diamagnetic. DD-484
• Opposes magnetic fields. DD-484
• Nonimmigrant work visa. DD-483
• Employer. DD-483
• Diversity, equity and inclusion. DD-482
• Representation. DD-482
• The president. DD-481
• Federal government. DD-481
• Sikorsky. DD-480
• 1979. DD-480
• Vortex ring. DD-479
• Trapped air. DD-479
• Glass bulb or fusible link. DD-478
• Expands with heat. DD-478
• Kestrel, a falcon. DD-477
• Signature hunting style. DD-477
• Deliberately. DD-476
• Trained. DD-476
• Solar wind. DD-475
• Past the planets. DD-475
• Kinetic launch. DD-474
• Vacuum-sealed. DD-474
• 1,776 ft (541 m). DD-473
• 1776. DD-473
• Cephalopod. DD-472
• Indo-Pacific. DD-472
• Near Oświęcim, Poland. DD-471
• I, Birkenau, Monowitz. DD-471
• Layers of ice. DD-470
• Cold temperatures. DD-470
• Silicon wafer. DD-469
• Photoresist. DD-469
• Hexagonal. DD-468
• Hydrogen bonds. DD-468
• Double coat. DD-467
• Repel water and snow. DD-467
• Little birch. DD-466
• 1948. DD-466
• Around week four. DD-465
• Neural crest cells. DD-465
• Galaxy mergers. DD-464
• Two black holes. DD-464
• Amphibious water bomber. DD-463
• Canadair/Bombardier. DD-463
• 2006. DD-462
• Sony Bravia. DD-462
• Video is still frames. DD-461
• Rotation matches frame rate. DD-461
• Decentralized. DD-460
• Trails guide ants. DD-460
• Forensic blood detection. DD-459
• Hydrogen peroxide. DD-459
• Double coat. DD-458
• Repel water and snow. DD-458
• Rubber and polymers. DD-457
• Days to months. DD-457
• Colonies of zooids. DD-456
• Feeding, movement, reproduction. DD-456
• January 31, 2000. DD-455
• MD-83. DD-455
• Less need for glasses. DD-454
• The cornea. DD-454
• Juvenile trevally and filefish. DD-453
• Inside the bell. DD-453
• Largest living lizard. DD-452
• Flexible. DD-452
• Russian heavy-lift rocket. DD-451
• GLONASS launch crashed. DD-451
• Remove flue tiles. DD-450
• Spins the head. DD-450
• About 95% of international data, per the Reel. DD-449
• Hair-thin glass. DD-449
• Nerves and vessels. DD-448
• Infected pulp removed. DD-448
• Laser ablation. DD-447
• Rust absorbs more energy. DD-447
• Fuel and oxidizer each have one. DD-446
• Enter the chamber as gas. DD-446
• Potassium chlorate releases oxygen. DD-445
• Sugar in the gummy. DD-445
• Hexagonal. DD-444
• Hydrogen bonds. DD-444
• Hormuz Island. DD-443
• Iron oxide. DD-443
• Ernő Rubik, 1974. DD-442
• 54 squares. DD-442
• Ivy and creeping fig. DD-441
• Cools surfaces. DD-441
• Layer by layer. DD-440
• Concrete mixes. DD-440
• Almost all bamboo. DD-439
• 12 to 38 kg a day. DD-439
• Multiple jointed fingers. DD-438
• Reads muscle signals. DD-438
• Drones coordinate. DD-437
• Software controls them. DD-437
• Ground-attack C-130 variant. DD-436
• Late 1960s, Vietnam War. DD-436
• North Africa and the Middle East. DD-435
• Scales above the eyes. DD-435
• No human pilot. DD-434
• Cameras and AI. DD-434
• Frogs and amphibians. DD-433
• Rainforest and fresh water. DD-433
• Several eggs. DD-432
• Days apart. DD-432
• Old varnish yellows. DD-431
• Solvents tested first. DD-431
• About 24 million. DD-430
• Yangtze delta. DD-430
• Treadmill or ball. DD-429
• Update with movement. DD-429
• Sahara, Arabia, Australia. DD-428
• Drifting and abrasive. DD-428
• Mainly bone. DD-427
• 70 to 90 percent. DD-427
• Trigonognathus kabeyai. DD-426
• Off Japan and Hawaii. DD-426
• Cameras or sensors identify items. DD-425
• Bursts eject items. DD-425
• Wide spray pattern. DD-424
• Water absorbs heat. DD-424
• Curves and cylinders. DD-423
• Two lower, one upper. DD-423
• Jellyfish. DD-422
• Scissor-like. DD-422
• A blade is released at full power. DD-421
• The casing must hold fragments. DD-421
• Bites or scratches. DD-420
• Along nerves to the brain. DD-420
• Very wide tires. DD-419
• Low pressure for flotation. DD-419
• Electrified inner grid. DD-418
• Transformer steps up voltage. DD-418
• February 2016. DD-417
• A clap. DD-417
• At least 3,336 deaths, 2017-2022, per the Reel. DD-416
• Nearly two a day. DD-416
• They dunk food. DD-415
• Probably not for cleaning. DD-415
• Gas, ash and rock. DD-414
• Can exceed 700 km/h. DD-414
• Pressure below vapor pressure. DD-413
• Vapor bubbles form. DD-413
• October 18, 1951. DD-412
• Semipalatinsk. DD-412
• Heavy-duty flatcars. DD-411
• Chains and chocks. DD-411
• Spillways and canals. DD-410
• Concrete. DD-410
• Pushes snow aside. DD-409
• Spinning blades throw snow. DD-409
• Surgeon controls from a console. DD-408
• Robotic arms hold tools. DD-408
• Iron oxide. DD-407
• Citric to hydrochloric. DD-407
• Rhône Valley, Valais. DD-406
• LSGS. DD-406
• Nikola Tesla, about 1891. DD-405
• Primary and secondary. DD-405
• A leading cause of deaths. DD-404
• Fall-arrest systems save lives. DD-404
• Luigi Cani. DD-403
• January 2022. DD-403
• Hand cranks or pedals. DD-402
• Wooden tubs. DD-402
• January 1, 2024. DD-401
• Pyeongchang County. DD-401
• 33 Thomas Street. DD-400
• 550 ft. DD-400
• Samples reveal composition. DD-399
• Long-handled picks and hammers. DD-399
• Cores are drilled from ice sheets. DD-398
• Some exceed 3,000 m. DD-398
• Mushrooms are fungal fruiting bodies. DD-397
• Gills, pores or spines. DD-397
• E = mc². DD-396
• Einstein published it in 1905. DD-396
• Plasmodium parasites. DD-395
• Female Anopheles mosquitoes. DD-395
• Ultrasound is used. DD-394
• Reflected sound makes a standing wave. DD-394
• About 17 a day. DD-393
• About 6,000 a year. DD-393
• Oil floats on water. DD-392
• Belts, discs, drums or tubes. DD-392
• Lava exceeds 1,100 C. DD-391
• Snow flashes to steam. DD-391
• Water, mud and debris. DD-390
• Rain, volcanoes, dam failures. DD-390
• Exposes the die. DD-389
• Nitric or sulfuric acid. DD-389
• Silver iodide or salt. DD-388
• Act as ice or condensation nuclei. DD-388
• Bubbles emit flashes. DD-387
• Driven by intense sound. DD-387
• High-frequency sound. DD-386
• Bubbles collapse. DD-386
• Asteroids and comets. DD-385
• About 4.1 to 3.8 billion years ago. DD-385
• Machines freeze and aerate. DD-384
• Sets portion and shape. DD-384
• Plastic, metal, wood, shell. DD-383
• Injection molded. DD-383
• Ice freezes in molds. DD-382
• Cranes lift blocks. DD-382
• An inflatable soft palate. DD-381
• Male dromedaries. DD-381
• About 34 x 11 x 11 km. DD-380
• 1898. DD-380
• Pattaya, Thailand. DD-379
• About 105 m. DD-379
• White fish surimi. DD-378
• Often Alaska pollock. DD-378
• Costasiella kuroshimae. DD-377
• About 5 mm. DD-377
• Cut in blocks. DD-376
• Diamond wire saws cut stone. DD-376
• Not erupting but not extinct. DD-375
• New magma can rise. DD-375
• United Launch Alliance. DD-374
• Three Common Booster Cores. DD-374
• Eid travel peaks. DD-373
• Passengers ride on roofs. DD-373
• Sand has large pore spaces. DD-372
• Water infiltrates quickly. DD-372
• Compressed under high pressure. DD-371
• Liquefied at about -162 C. DD-371
• Samut Songkhram Province. DD-370
• Trains pass several times daily. DD-370
• Rain overwhelms drainage. DD-369
• Concrete and asphalt are impermeable. DD-369
• Cotton is compressed into modules. DD-368
• Truck beds have conveyors. DD-368
• Stop trash before the sea. DD-367
• Racks block large debris. DD-367
• Circular blades on a vertical boom. DD-366
• Hung beneath a helicopter. DD-366
• Pads grip rotors. DD-365
• Motion becomes heat. DD-365
• They are uncrewed aircraft. DD-364
• Thermal cameras find hotspots. DD-364
• Shenzhen. DD-363
• About 306 m. DD-363
• Larvae need water. DD-362
• Culex lays egg rafts. DD-362
• Aluminum displaces copper. DD-361
• Acid removes aluminum's oxide. DD-361
• Two solid rocket boosters. DD-360
• Three main engines. DD-360
• It is an off-highway haul truck. DD-359
• About 250 short tons. DD-359
• The reaction releases heat. DD-358
• It makes aluminum bromide. DD-358
• Lagothrix. DD-357
• Northwestern South America. DD-357
• Opposing waves combine. DD-356
• Nodes do not move. DD-356
• Philip Bono proposed it. DD-355
• 1960s. DD-355
• Balaeniceps rex. DD-354
• Central and eastern African swamps. DD-354
• Unburned fuel ignites in the exhaust. DD-353
• Exhaust gases are very hot. DD-353
• Mangroves line tropical coasts. DD-352
• Above-ground roots extend into water. DD-352
• Honey hunting is traditional. DD-351
• Hives hang on cliffs. DD-351
• Combines separate grain from chaff. DD-350
• Wheat, corn, soybeans. DD-350
• Largest native moth in North America. DD-349
• Up to about 6 inches. DD-349
• The Golden Ellipse dates to 1968. DD-348
• Its proportions follow the golden ratio. DD-348
• Stress grows with spin speed. DD-347
• CDs are polycarbonate. DD-347
• Low pressure condenses moisture. DD-346
• It is called a vapor cone. DD-346
• Soap is made by saponification. DD-345
• The head is hydrophilic. DD-345
• Copper loses electrons. DD-344
• Silver ions gain electrons. DD-344
• Peacock spiders are Maratus. DD-343
• Most are 4 to 6 mm long. DD-343
• Some leeches eat earthworms. DD-342
• Not all leeches drink blood. DD-342
• Early stairs were cut into rock. DD-341
• Romans built elaborate stairs. DD-341
• It was a converted Boeing 747. DD-340
• It carried up to 19,200 gallons. DD-340
• Removing oxygen stops a fire. DD-339
• The Reel shows a steel dome. DD-339
• It is central to quantum mechanics. DD-338
• Schrödinger published it in 1926. DD-338
• Rollers feed bills. DD-337
• Sensors register notes. DD-337
• Slime molds are not fungi. DD-336
• Some cells gather into a mass. DD-336
• Bromine is liquid at room temperature. DD-335
• Its vapor is reddish brown. DD-335
• Intake, compression, power, exhaust. DD-334
• Gasoline engines use spark plugs. DD-334
• Development starts with a zygote. DD-333
• Rapid divisions are called cleavage. DD-333
• Pyrex has an index of about 1.47. DD-332
• Vegetable oils are similar. DD-332
• Coal dust escapes in transit. DD-331
• Stations spray water or binders. DD-331
• Hiroshima was bombed on August 6, 1945. DD-330
• Nagasaki was bombed on August 9, 1945. DD-330
• Data is stored as pits and lands. DD-329
• The track is a spiral. DD-329
• Cubes have flat faces. DD-328
• More cubes approximate a sphere better. DD-328
• A googol is 10 to the 100th. DD-327
• Gears can reduce speed. DD-327
• A bubble is a thin water film. DD-326
• The film freezes in deep cold. DD-326
• It lives in West African rainforests. DD-325
• It lives in trees. DD-325
• Ectogenesis is growth outside the body. DD-324
• Research targets premature babies. DD-324
• Dredgers remove sediment. DD-323
• They keep channels deep. DD-323
• Hydras are a few millimeters long. DD-322
• Tentacles catch prey. DD-322
• Strong winds rock the trees. DD-321
• Root plates lift and drop. DD-321
• IVF fertilizes eggs in the lab. DD-320
• Ovaries are stimulated. DD-320
• Particles are modeled as strings. DD-319
• Superstring theory needs 10 dimensions. DD-319
• Icebreakers clear paths through ice. DD-318
• Sloped bows ride up onto ice. DD-318
• Pencils were first sharpened with knives. DD-317
• Lassimone patented a sharpener in 1828. DD-317
• Melting ice feeds the falls. DD-316
• Falls grow in warm seasons. DD-316
• Heart muscle cells are cardiomyocytes. DD-315
• They conduct electrical impulses. DD-315
• It ignites in air at around 30 °C. DD-314
• It burns to phosphorus pentoxide. DD-314
• Transcription copies DNA into RNA. DD-313
• RNA polymerase does the copying. DD-313
• Riders use stairs and rails. DD-312
• It draws on trials riding. DD-312
• They live in South and Southeast Asia. DD-311
• Males build the nests. DD-311
• Sea angels are marine snails. DD-310
• Adults have no shell. DD-310
• Phages are viruses of bacteria. DD-309
• They inject genetic material. DD-309
• Its scientific name is Rhopilema esculentum. DD-308
• It lives off China, Korea and Japan. DD-308
• They are called water bears. DD-307
• Usually 0.3 to 0.5 mm long. DD-307
• Female anglerfish carry the lure. DD-306
• The lure is a modified dorsal spine. DD-306
• Cognify is a 2024 concept video, not a real prison system. DD-305
• Snopes found no such technology exists. DD-305
• Ballpoint tips use steel, brass or tungsten carbide balls. DD-304
• László Bíró filed his British patent in 1938. DD-304
• Eli H. Janney patented the knuckle coupler in 1873. DD-303
• The Safety Appliance Act of 1893 required automatic couplers. DD-303
• Ice and graupel collisions separate charge in storms. DD-302
• Thunder is air expanding from lightning's heat. DD-302
• Rolling shutters read the frame row by row. DD-301
• Global shutters expose all pixels at once. DD-301
• Safety matches need the phosphorus on the striker. DD-300
• Potassium chlorate supplies oxygen to the flame. DD-300
• Ice absorbs slightly more red light than blue. DD-299
• Bubbles make ice look white. DD-299
• Lava typically ranges from 700 to 1,200 °C. DD-298
• Rising mantle rock melts as pressure drops. DD-298
• Chernobyl's Reactor 4 exploded on April 26, 1986. DD-297
• The Elephant's Foot is a mass of corium. DD-297
• Surface tension comes from water molecules pulling on each other. DD-296
• Adhesion is attraction to other surfaces. DD-296
• Only 21 B-2s were built. DD-295
• The program averaged $2.13 billion per aircraft. DD-295
• Spiders draw silk through spinnerets. DD-294
• Orb weavers add the sticky spiral last. DD-294
• Marine polyclad flatworms glide on cilia. DD-293
• Planarians can regrow whole bodies from fragments. DD-293
• Velvet worms trap prey with sticky slime. DD-292
• The largest known velvet worm reaches about 22 cm. DD-292
• Kelp can grow up to 18 inches a day. DD-291
• Kelp forests grow in cool, shallow coastal waters. DD-291
• MRI uses magnets and radio waves and has no spinning parts. DD-290
• A CT scanner's X-ray tube spins on a ring gantry. DD-290
• The ghost fungus lives mainly in southern Australia and Tasmania. DD-289
• It's poisonous, though not lethal. DD-289
• Snowflakes have six-fold symmetry from ice's crystal structure. DD-288
• Temperature and humidity shape each growth stage. DD-288
• Plasma is ionized gas that conducts and glows. DD-287
• Grape halves can concentrate microwaves enough to spark plasma. DD-287
• Releasing one ball sends one ball out the other end. DD-286
• The cradle is credited to Edme Mariotte. DD-286
• Sodium and water make sodium hydroxide and hydrogen. DD-285
• The initial burst may be a Coulomb explosion. DD-285
• Mechanical calculators divide by repeated subtraction. DD-284
• Some keep cycling forever when asked to divide by zero. DD-284
• The ceremony opens each Games. DD-283
• It showcases the host nation's culture. DD-283
• It opened on July 17, 2015. DD-282
• Paul Rudd plays Scott Lang. DD-282
• It opened on May 1, 2015. DD-281
• Ultron is an AI made by Stark and Banner. DD-281
• It opened on August 1, 2014. DD-280
• James Gunn wrote and directed. DD-280
• It opened on April 4, 2014. DD-279
• The Russo brothers directed. DD-279
• It opened on November 8, 2013. DD-278
• Alan Taylor directed. DD-278
• It opened on May 3, 2013. DD-277
• It began Phase Two. DD-277
• It lives in South and Southeast Asia. DD-276
• It is black with a white belly. DD-276
• Neurons meet at synapses. DD-275
• Neurotransmitters are stored in vesicles. DD-275
• A gyroscope has a spinning rotor. DD-274
• Its stability comes from conserved angular momentum. DD-274
• An avalanche is a rapid flow of snow down a slope. DD-273
• Snowfall, warming and people trigger them. DD-273
• Bald eagles and African fish eagles catch fish. DD-272
• They spot fish from high above. DD-272
• Aluminum has a protective oxide layer. DD-271
• Mercury forms an amalgam with aluminum. DD-271
• The US tested at Bikini Atoll after WWII. DD-270
• Operation Crossroads took place in 1946. DD-270
• A thin air film delays merging. DD-269
• Each stage leaves a smaller drop. DD-269
• Baobabs belong to the genus Adansonia. DD-268
• They grow in Africa, Madagascar and Australia. DD-268
• Expanding gas drives explosive eruptions. DD-267
• Magma shatters into ash and rock. DD-267
• The explosion happened on August 4, 2020. DD-266
• About 2,750 tons of ammonium nitrate exploded. DD-266
• The sinoatrial node is the heart's natural pacemaker. DD-265
• The atria contract first. DD-265
• A brinicle is a hollow ice tube. DD-264
• Cold dense brine sinks from sea ice. DD-264
• Kardashev proposed the scale in 1964. DD-263
• Type I uses all energy reaching its planet. DD-263
• Snakes have four main modes of movement. DD-262
• Serpentine movement is the most common. DD-262
• The vision is in the Book of Ezekiel. DD-261
• Each cherub has four faces. DD-261
• Ferrofluid holds magnetic nanoparticles. DD-260
• Steve Papell invented it at NASA in 1963. DD-260
• NASA was established in 1958. DD-259
• Apollo landed 12 astronauts on the Moon. DD-259
• The ISS orbits about 400 km up. DD-258
• It circles Earth every 90 minutes. DD-258
• The first shuttle flew in 1981. DD-257
• Orbiter, external tank and boosters. DD-257
• Hubble launched on April 24, 1990. DD-256
• Astronauts fixed its mirror in 1993. DD-256
• Satellites relay TV and phone signals. DD-255
• Navigation satellites enable GPS. DD-255
• Dune bashing is driving 4x4s over dunes. DD-254
• Dune buggies are popular. DD-254
• Ski Dubai opened in 2005. DD-253
• It covers 22,500 square meters. DD-253
• The Dubai Mall has over 1,200 shops. DD-252
• It has an aquarium with a tunnel. DD-252
• The Burj Khalifa is 828 m tall. DD-251
• The Burj Al Arab is shaped like a sail. DD-251
• The island is reclaimed land. DD-250
• Construction began in 2001. DD-250
• Dubai Police began adding supercars in 2013. DD-249
• The fleet includes Lamborghinis and Ferraris. DD-249
• It opened on May 4, 2012. DD-248
• It closed Phase One. DD-248
• It opened on July 22, 2011. DD-247
• Chris Evans played Steve Rogers. DD-247
• It opened on May 6, 2011. DD-246
• Chris Hemsworth played Thor. DD-246
• It opened on May 7, 2010. DD-245
• Scarlett Johansson debuted as Black Widow. DD-245
• It opened on June 13, 2008. DD-244
• Norton played Banner. DD-244
• Iron Man opened on May 2, 2008. DD-243
• It launched the MCU. DD-243
• Steel is iron with a little carbon. DD-242
• Ore is smelted in a blast furnace. DD-242
• Textiles start as natural or synthetic fibers. DD-241
• Spinning twists fibers into yarn. DD-241
• Concrete is cement, aggregates and water. DD-240
• Cement hardens by reacting with water. DD-240
• The core is graphite mixed with clay. DD-239
• More clay makes a harder lead. DD-239
• Chips are built on silicon wafers. DD-238
• Wafers are coated with photoresist. DD-238
• Cars use steel, aluminum and plastics. DD-237
• Metal sheets are stamped into panels. DD-237
• Lithium, nickel, cobalt and graphite are key. DD-236
• The anode is usually graphite. DD-236
• Masashi Kishimoto created Naruto. DD-235
• Naruto wants to be Hokage. DD-235
• It premiered in 1979. DD-234
• Yoshiyuki Tomino created it. DD-234
• Hajime Isayama created it. DD-233
• Humanity lives behind walls. DD-233
• Tite Kubo created Bleach. DD-232
• Ichigo can see ghosts. DD-232
• Ohba wrote and Obata drew it. DD-231
• Names written in it die. DD-231
• It began as a web novel. DD-230
• The webtoon followed in 2018. DD-230
• Toriyama created Dragon Ball. DD-229
• Dragon Ball Z aired from 1989. DD-229
• Tatsuki Fujimoto created Chainsaw Man. DD-228
• MAPPA made the 2022 anime. DD-228
• Rumiko Takahashi created Inuyasha. DD-227
• Kagome falls through a well. DD-227
• Gege Akutami created it. DD-226
• MAPPA made the anime from 2020. DD-226
• Hiromu Arakawa created it. DD-225
• It was adapted in 2003 and 2009. DD-225
• He crowned himself emperor in 1804. DD-224
• His code influenced civil law worldwide. DD-224
• He won at Sekigahara in 1600. DD-223
• He became shogun in 1603. DD-223
• He was born Temüjin around 1162. DD-222
• He became Great Khan in 1206. DD-222
• She reigned from 1837 to 1901. DD-221
• Only Elizabeth II reigned longer. DD-221
• She reigned from 1558 to 1603. DD-220
• She was the last Tudor monarch. DD-220
• She was born a German princess in 1729. DD-219
• She took power in a 1762 coup. DD-219
• He became emperor in 1894. DD-218
• Russia lost the war of 1904 to 1905. DD-218
• He ruled the Franks from 768. DD-217
• He was crowned emperor in 800. DD-217
• He became King of England in 1016. DD-216
• He became King of Denmark in 1018. DD-216
• His nickname came from the boots he wore as a child. DD-215
• He became emperor in AD 37. DD-215
• Nero ruled from AD 54 to 68. DD-214
• He performed in public. DD-214
• Augustus was born Gaius Octavius in 63 BC. DD-213
• He was Julius Caesar's adopted son. DD-213
• Tundra is a treeless biome. DD-212
• There's Arctic and alpine tundra. DD-212
• Plains are flat or gently rolling. DD-211
• Many have deep, fertile soils. DD-211
• Canyons are deep, steep-sided valleys. DD-210
• Most are cut by rivers over millions of years. DD-210
• Boron is element 5, a metalloid. DD-209
• Plants need boron to grow. DD-209
• Minecraft is a sandbox game. DD-208
• It was fully released in 2011. DD-208
• Israel declared independence on May 14, 1948. DD-206
• It came as the British Mandate ended. DD-206
• The war began in February 2014. DD-205
• Russia annexed Crimea from The Ukraine in March 2014. DD-205
• Iran is a country in West Asia. DD-204
• Cyrus the Great founded the Achaemenid Empire. DD-204
• Pterosaurs were flying reptiles. DD-203
• They were close relatives, not dinosaurs. DD-203
• T. rex lived about 68 to 66 million years ago. DD-202
• The largest reached about 12 m long. DD-202
• Triceratops lived about 68 to 66 million years ago. DD-201
• Its name means 'three-horned face'. DD-201
• Bora Bora is in French Polynesia. DD-200
• Mount Otemanu rises 727 m. DD-200
• Fiji has more than 330 islands. DD-199
• Viti Levu is the largest island. DD-199
• Marrakech was founded around 1070. DD-198
• It's named for its red-ochre walls. DD-198
• Barcelona is the capital of Catalonia. DD-197
• The Sagrada Família has been under construction since 1882. DD-197
• Santorini is in the southern Aegean. DD-196
• Its crescent is a flooded caldera. DD-196
• Kyoto was the imperial capital from 794 to 1868. DD-195
• It has about 1,600 Buddhist temples. DD-195
• Lobsters keep growing by molting. DD-194
• Older lobsters stay fertile. DD-194
• Squid have three hearts. DD-193
• Two hearts pump blood to the gills. DD-193
• Orcas are the largest dolphins. DD-192
• Offspring stay with their mothers. DD-192
• Seahorses are fish in the genus Hippocampus. DD-191
• Males carry the developing young. DD-191
• Spider crabs belong to the Majoidea. DD-190
• The Japanese spider crab spans up to about 3.7 m. DD-190
• Great whites live in coastal waters worldwide. DD-189
• They ambush seals from below. DD-189
• Cryptocurrencies use cryptography for security. DD-188
• Most run on a decentralized blockchain. DD-188
• The SEC was created in 1934. DD-187
• It followed the 1929 crash. DD-187
• Fiat money isn't backed by gold or silver. DD-186
• Its value rests on decree and trust. DD-186
• Bruce McLaren founded the team in 1963. DD-185
• It entered Formula One in 1966. DD-185
• Horacio Pagani founded the company in 1992. DD-184
• Horacio Pagani was born in Argentina. DD-184
• Rolls and Royce founded the company in 1906. DD-183
• It built aircraft engines from WWI. DD-183
• Ettore Bugatti founded the company in 1909. DD-182
• It was founded in Molsheim, Alsace. DD-182
• Ferruccio Lamborghini founded the company in 1963. DD-181
• He first made his fortune in tractors. DD-181
• Ferrari is based in Maranello, Italy. DD-180
• Enzo founded a company in 1939; the first Ferrari car came in 1947. DD-180
• Rabbits are in the family Leporidae. DD-179
• They eat mostly grasses and plants. DD-179
• Sheep are social flock animals. DD-178
• They recognized about 50 faces in a 2001 study. DD-178
• Bears have one of the keenest noses on land. DD-177
• Large nasal cavities hold lots of scent tissue. DD-177
• Ladybugs are beetles of family Coccinellidae. DD-176
• There are about 6,000 species. DD-176
• Butterflies have taste receptors on their feet. DD-175
• Taste receptors are also on the palps. DD-175
• The waggle dance tells bees where food is. DD-174
• Foragers dance a figure-eight on the comb. DD-174
• Cherry blossoms come from several Prunus species. DD-173
• Bloom timing depends mainly on temperature. DD-173
• Young sunflowers follow the Sun. DD-172
• They swing back east overnight. DD-172
• Roses belong to the genus Rosa. DD-171
• There are over 300 species. DD-171
• Emerald is green beryl. DD-170
• Its color comes from chromium and sometimes vanadium. DD-170
• Opal is hydrated amorphous silica. DD-169
• Precious opal shows play-of-color. DD-169
• Quartz is silicon dioxide. DD-168
• It's one of the most common minerals in the crust. DD-168
• Ruby is a red variety of corundum. DD-167
• Chromium gives ruby its red color. DD-167
• Sapphire is gem corundum. DD-166
• Iron and titanium make it blue. DD-166
• Diamond is carbon in a cubic lattice. DD-165
• Most formed 150 to 250 km deep. DD-165
• It lives in the eastern Himalayas and SW China. DD-164
• It's the only living member of Ailuridae. DD-164
• It's the longest venomous snake. DD-163
• It reaches about 5.5 m. DD-163
• Dugongs and manatees are sirenians. DD-162
• They live from East Africa to the Pacific. DD-162
• It lives in central and southwest China. DD-161
• It has golden-orange fur and a blue face. DD-161
• Leopards have dark rosettes. DD-160
• They have the widest range of any wild cat. DD-160
• The giant panda is a bear. DD-159
• It's native to central China. DD-159
• It's the world's tallest building at 828 m. DD-158
• It stands in Dubai, UAE. DD-158
• It's a 102-story Art Deco skyscraper. DD-157
• Shreve, Lamb & Harmon designed it. DD-157
• It was built for the 1889 World's Fair. DD-156
• It's a wrought-iron lattice tower. DD-156
• Metals give characteristic flame colors. DD-155
• Strontium gives red. DD-155
• Lenticular clouds are lens-shaped and stationary. DD-154
• They form in waves of air flowing over obstacles. DD-154
• The falls lie on the Argentina-Brazil border. DD-153
• There are about 275 individual falls. DD-153
• SAMs are launched from the ground or ships. DD-152
• They target aircraft, drones and missiles. DD-152
• A railgun is an electromagnetic launcher. DD-151
• Current runs through rails and the projectile. DD-151
• Military helicopters carry troops, rescue people and scout. DD-150
• The AH-64 Apache is a US attack helicopter. DD-150
• Submarines dive by flooding ballast tanks. DD-149
• Blowing the tanks with air brings them up. DD-149
• It's built by Airbus, BAE Systems and Leonardo. DD-148
• It first flew in 1994. DD-148
• The class is US Navy guided-missile destroyers. DD-147
• USS Arleigh Burke was commissioned in 1991. DD-147
• The Tiger II was a German heavy tank used 1944-45. DD-146
• It weighed about 68 to 70 tonnes. DD-146
• Dolphins breathe voluntarily. DD-145
• One brain hemisphere sleeps at a time. DD-145
• The humpback is a baleen whale. DD-144
• Songs are sung by males. DD-144
• Jellyfish are the medusa stage of some cnidarians. DD-143
• They contract the bell to push water out. DD-143
• There are five living rhino species. DD-142
• The white rhino has southern and northern subspecies. DD-142
• Pangolin scales are made of keratin. DD-141
• Four species are African and four Asian. DD-141
• There are three living elephant species. DD-140
• Family herds are led by an older female. DD-140
• The meerkat is a small mongoose. DD-139
• It lives in southern Africa's arid regions. DD-139
• The impala is an African antelope. DD-138
• Only males have lyre-shaped horns. DD-138
• Hippos secrete a red fluid called 'blood sweat'. DD-137
• Its pigments absorb UV light. DD-137
• The cheetah is the fastest land animal. DD-136
• It reaches about 93-104 km/h in sprints. DD-136
• Giraffes have seven neck vertebrae. DD-135
• Each vertebra is greatly elongated. DD-135
• Lions live in prides. DD-134
• Prides center on related females. DD-134
• Mercury has only a thin exosphere. DD-133
• Days reach about 430 °C. DD-133
• Venus rotates opposite to most planets. DD-132
• One sidereal rotation takes about 243 Earth days. DD-132
• Earth is an oblate spheroid. DD-131
• Its rotation causes the bulge. DD-131
• Olympus Mons is a shield volcano. DD-130
• It stands about 21.9 km high. DD-130
• The Great Red Spot is a giant anticyclone. DD-129
• It's wider than Earth, though shrinking. DD-129
• The Cassini Division lies between the A and B rings. DD-128
• Giovanni Cassini discovered it in 1675. DD-128
• Uranus is tilted about 98 degrees. DD-127
• Voyager 2 visited Uranus in 1986. DD-127
• Neptune's winds reach about 2,100 km/h. DD-126
• Voyager 2 saw the Great Dark Spot in 1989. DD-126
• Pluto was reclassified as a dwarf planet in 2006. DD-125
• Pluto's heart is named Tombaugh Regio. DD-125
• Some large raptors resolve about twice the detail humans do. DD-124
• Eagles have deep foveae. DD-124
• The Taj Mahal was built as a tomb for Mumtaz Mahal. DD-123
• UNESCO listed it in 1983. DD-123
• Sea stars are echinoderms, not fish. DD-122
• Many sea stars can regrow lost arms. DD-122
• The Colosseum was completed in AD 80. DD-121
• Sailors from Misenum worked the velarium. DD-121
• Chichen Itza became a World Heritage Site in 1988. DD-120
• The equinox shadow looks like a serpent descending. DD-120
• Polar bears are classed as marine mammals. DD-119
• Ursus maritimus means 'maritime bear'. DD-119
• Machu Picchu is a 15th-century Inca citadel in Peru. DD-118
• Most think it was an estate for Pachacuti. DD-118
• The SR-71 is a retired Mach 3+ reconnaissance aircraft. DD-117
• Lockheed developed it in the 1960s from the A-12. DD-117
• It stands on Corcovado mountain in Rio de Janeiro. DD-116
• Paul Landowski and Heitor da Silva Costa designed it. DD-116
• They breed through the Antarctic winter. DD-115
• The female passes the single egg to the male. DD-115
• Petra was the Nabataean capital. DD-114
• It's known for rock-cut architecture and water conduits. DD-114
• Plasma is called the fourth state of matter. DD-113
• Electrons are stripped from atoms, leaving ions. DD-113
• Each tiger has a unique stripe pattern. DD-112
• Researchers identify tigers from photos. DD-112
• It's a series of walls built over about 2,000 years. DD-111
• Qin Shi Huang connected earlier walls after 221 BC. DD-111
• Naruto follows an outcast ninja. DD-110
• One Punch Man's hero wins with one punch. DD-110
• Rocket League is a vehicular soccer game. DD-109
• It was developed and published by Psyonix. DD-109
• The killer was active in Whitechapel in 1888. DD-108
• Five victims are known as the 'canonical five'. DD-108
• Martha Washington was the first first lady. DD-107
• She took to riding as a girl. DD-107
• Quasars are luminous active galactic nuclei. DD-106
• They're powered by supermassive black holes. DD-106
• It covers about 10 km² around the Chernobyl plant. DD-105
• Reactor 4 exploded on April 26, 1986. DD-105
• It was built on the island of Pharos under Ptolemy II. DD-104
• Estimates put it above 100 m. DD-104
• It infects carpenter ants in tropical forests. DD-103
• Infected ants bite down on a leaf vein. DD-103
• It was a bronze statue of the sun god Helios. DD-102
• It stood about 33 m (108 ft) tall. DD-102
• Why zebras have stripes has been debated since the 19th century. DD-101
• The leading explanation is protection from biting flies. DD-101
• Mausolus was a satrap of Caria. DD-100
• Earthquakes destroyed the tomb in the Middle Ages. DD-100
• Cleopatra's first language was Greek. DD-099
• She was the first Ptolemaic ruler known to learn Egyptian. DD-099
• Herostratus burned the temple in 356 BC. DD-098
• The rebuilt temple lasted until 401 AD. DD-098
• Venom is injected. DD-097
• Poison is eaten, inhaled or absorbed. DD-097
• Phidias made the statue around 435 BC. DD-096
• It was made of ivory and gold. DD-096
• Lovelace published her notes in 1843. DD-095
• Note G computes Bernoulli numbers. DD-095
• The gardens' location has never been confirmed. DD-094
• One theory places them at Nineveh. DD-094
• Photo 51 was taken in Franklin's lab in 1952. DD-093
• Franklin died in 1958, before the 1962 Nobel. DD-093
• The Great Pyramid is the oldest ancient wonder. DD-092
• It is the only one still largely intact. DD-092
• CMEs are eruptions of plasma and magnetic field from the corona. DD-091
• A CME can carry billions of tons of material. DD-091
• Fireflies are beetles. DD-090
• Light is made in the abdomen. DD-090
• The event horizon is a boundary. DD-089
• Not even light escapes. DD-089
• They are among the smallest birds. DD-088
• Their metabolism is extremely high. DD-088
• Nebulae are clouds of gas and dust. DD-087
• Emission, reflection and dark. DD-087
• Geodes are hollow and crystal-lined. DD-086
• They start as cavities. DD-086
• It struck on March 18, 1925. DD-085
• It crossed Missouri, Illinois and Indiana. DD-085
• He reached the summit on May 29, 1953. DD-084
• He climbed with Edmund Hillary. DD-084
• It was a recoilless rifle. DD-083
• It fired the M388. DD-083
• Robots copy animal movement. DD-082
• Some fly like insects and birds. DD-082
• Philip II hired Aristotle around 343 BC. DD-081
• Alexander was about 13. DD-081
• Entangled particles share a quantum state. DD-080
• Measurements are correlated at any distance. DD-080
• It lies in the western North Atlantic. DD-079
• Miami, Bermuda and Puerto Rico. DD-079
• Nero ruled from 54 to 68 AD. DD-078
• He sang and acted in public. DD-078
• The Chimera comes from Greek myth. DD-077
• It breathed fire. DD-077

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