Why Jumping Builds Bone: How a Few Hops a Day Strengthen Your Skeleton
Your bones are not dead scaffolding. They are living tissue, and they pay close attention to how hard you land.
The Riderless Bicycle: Why Bikes Stay Upright, and Why Scientists Got It Wrong for a Century
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.
Puzzle of the Day: Spot 6 Differences at the Picnic
Two sunny picnic scenes look identical, but picture B hides 6 changes. Can you spot them all before you open the answer?
The 5 Best Solar Prominence Images Ever Captured
Solar Orbiter 2022, Norikura 1992, SDO 2012, SOHO’s whip, and the 1946 Grand Daddy — the best solar prominence images ever captured.
Best LEGO Architecture Sets, Ranked
Six current LEGO Architecture sets ranked by value and quality, led by the Great Pyramid of Giza (21058).
Best Espresso Machines (2026): Six Home Picks Compared
A café espresso shot is a short, concentrated brew pushed through finely ground coffee at roughly nine bars of pressure.
The Black Stone That Crowned a Sinking Pyramid: Amenemhat III’s Capstone
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.
The Sailing Stones of Death Valley: How Paper-Thin Ice Pushes Rocks Across a Dry Lake
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.
The Top That Flips Itself Over: Tippe Tops, Standing Eggs, and the Rattleback That Spins Backward
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.
One Bill to Rule Them All: The X Subscription Bundles Grok, Cursor and X Premium
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.
The Brass Spanner That Saved Britain: Defusing Hitler’s Magnetic Mine on the Shoeburyness Mud
How two HMS Vernon officers took apart Germany’s secret magnetic mine on the Shoeburyness mudflats in 1939, and how Britain answered with degaussing.
The Coin That Screams Toward Infinity: The Strange Physics of Euler’s Disk
A lunch-break toy from an aerospace lab sparked a Nature paper and a physics fight over what really stops a spinning coin.
The Unsinkable Iceberg: How Britain Nearly Built an Aircraft Carrier Out of Frozen Sawdust
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
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.
Puzzle of the Day: What Number Completes the Shape Cards?
Diamonds and circles on three score cards. Two totals are given — can you find the missing number on card C?
Best Noise-Cancelling Headphones (2026): Six Over-Ear Picks Compared
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.
The Bomb That Painted a Fleet: Operation Crossroads and the Ships No One Could Clean
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.
When Two Satellites Met at 26,000 mph: The 2009 Iridium–Cosmos Crash
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.
Spark in the Dark
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.
The Halifax Explosion: How a Harbour Collision Became the Largest Blast Before the Atomic Age
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’s Deadly Secret: The Giant Gas-Filled Lake That Rwanda Turned Into a Power Plant
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.