A rolling bicycle with nobody on it can steer itself upright. For a century the credit went to gyroscopes and trail. Then a 2011 bike with neither proved the real story was stranger.
Two sunny picnic scenes look identical, but picture B hides 6 changes. Can you spot them all before you open the answer?
Solar Orbiter 2022, Norikura 1992, SDO 2012, SOHO’s whip, and the 1946 Grand Daddy — the best solar prominence images ever captured.
Six current LEGO Architecture sets ranked by value and quality, led by the Great Pyramid of Giza (21058).
A café espresso shot is a short, concentrated brew pushed through finely ground coffee at roughly nine bars of pressure.
In 1900, inspectors at Dahshur found a carved black stone poking out of the sand: the capstone of Amenemhat III’s Black Pyramid, a monument that sank before its king could be buried in it.
For decades, rocks on Death Valley’s Racetrack Playa left trails no one saw form. Then GPS-tagged stones and a lucky winter pond caught paper-thin ice pushing them along.
A tippe top turns itself upside down, a spun hard-boiled egg stands on end, and a rattleback refuses to spin the wrong way. Friction explains all three.
SpaceXSI just merged Grok, Grok Bot, Cursor and X Premium into one plan with a shared weekly AI usage pool. Here’s what each tier from $0 to $200 a month gets you.
How two HMS Vernon officers took apart Germany’s secret magnetic mine on the Shoeburyness mudflats in 1939, and how Britain answered with degaussing.
A lunch-break toy from an aerospace lab sparked a Nature paper and a physics fight over what really stops a spinning coin.
In 1943 Britain seriously planned a 2-million-ton aircraft carrier made of pykrete, frozen water mixed with wood pulp. Here’s how Project Habakkuk got from a bathtub to a Canadian lake, and why it never sailed.
The black box isn’t black. How a jazz fan’s wire recorder became aviation’s memory, why recorders are orange, and why some are never found.
Diamonds and circles on three score cards. Two totals are given — can you find the missing number on card C?
Six over-ear noise-cancelling headphones compared, from the Sony WH-1000XM6 and Bose QuietComfort Ultra (2nd Gen) to AirPods Max 2, Sennheiser Momentum 4, Beats Studio Pro, and the $40 Soundcore Q20i.
In 1946 the Navy set off two atomic bombs among 90 empty warships at Bikini Atoll. The underwater Baker shot coated the fleet in radioactive mist that no amount of scrubbing could remove.
On February 10, 2009, a working Iridium satellite and a derelict Russian Cosmos bird collided at 11.7 km/s over Siberia—the first accidental intact-satellite smashup—and seeded thousands of debris fragments still tracked today.
Bite a Wint-O-Green Life Saver in the dark and it flashes blue. Meet triboluminescence: light from crushing crystals, from Ute quartz rattles to sticky tape that emits X-rays in a vacuum.
On December 6, 1917, the munitions ship Mont-Blanc exploded in Halifax Harbour after colliding with the Imo — killing nearly 2,000, blinding hundreds with shattered glass, and forging a lasting bond with Boston.
Lake Kivu holds enough dissolved gas to threaten two million people. Here is how it compares with Lake Nyos, what the 2021 Nyiragongo eruption revealed, and how Rwanda turned the lake’s methane into electricity.
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