Amsterdam's white bicycles, and the idea that outlived them
In 1965 Dutch activists left free white bikes on Amsterdam's streets. Hundreds of cities now run bike-share schemes, but Amsterdam never took one up.
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Concorde carried its last passengers in 2003. Nothing replaced it
Concorde's last passenger flight landed at Heathrow on October 24, 2003. Costs, noise and a fatal crash ended it, and no supersonic airliner has flown since.
Water puts out wood fires but makes oil fires worse
A water extinguisher works on wood because it cools the fuel. On burning oil, the same water splits the oil into droplets and makes the fire worse.
Two scholars needed a year to rebuild one Dead Sea scroll
Searches of 11 caves yielded around 900 Dead Sea Scrolls, mostly fragments. Rebuilding is slow, and a neural network has told two scribes apart.
Why a blast furnace makes iron, not steel
A blast furnace strips oxygen from iron ore to make pig iron, which carries too much carbon to be steel until a second furnace treats it.
Lake Chad has lost nine-tenths of its water since the 1960s
Sahel drought and rising irrigation demand cut Lake Chad to a tenth of its 1960s size. A two-year study found the shrinking stopped decades ago.
British rule spread left-hand driving to a third of the world
Britain kept the horseman's habit of riding on the left, then exported it through empire, while Napoleon's conquests pushed the continent right.
Finland has 3.3 million saunas for 5.6 million people
The sauna is thought to date back 10,000 years, to a heated pit. It became a place to cook, tend the sick and give birth.
Why packaging is hard to open, and how to get in
Clamshells, blister packs and shrinking bottle caps resist you by design: they deter theft, prove no tampering and cut shipping weight.
Why humanoid robots still struggle with balance and hands
A humanoid must balance on two legs, match a human hand and learn from demonstration. Figure and Tesla are trying, and Rodney Brooks sees a bubble.
The Antikythera mechanism's rebuilt front still needs proof
A 2021 model reconstructs the Antikythera mechanism's lost front gearing, but nobody has shown the ancient Greeks could have built it.
A tripped power line can black out a grid in seconds
Every generator on a grid must stay locked to one frequency. That is why one lost line can drag others down, as 33 lines did in the 2006 European blackout.
US Senate races barely mention Social Security's 2032 deadline
The US Social Security trust fund runs dry in 2032, and benefits drop 22% unless Congress acts. Few Senate candidates are discussing it.
Much ocean plastic sinks or washes ashore within a month
Most sea plastic sinks or beaches within a month. What escapes drifts in a gyre, or breaks into fragments small enough to reach a fish.
The UK road sign system, barely changed since 1965
The UK's road signs were designed by Jock Kinneir and Margaret Calvert in the 1960s, and the colour, shape and pictograms they set have barely changed since.
The sky is blue because air scatters blue light, not the sea
Air molecules scatter blue light far more than red. That's why the sky is blue, not because it reflects the sea, and why sunsets turn red.
Sinners is North America's biggest original hit since Inception
Ryan Coogler's original vampire film, set in 1932 Mississippi, drew doubters, then broke box office and Oscar records. It began with an uncle's blues records.
The US doesn't use the two-quarter rule to call a recession
A private committee at the NBER makes the call, weighing jobs, income and output. The UK's ONS calls the shorthand a technical recession.
Back pain is commoner in women, and strains are the top cause
Low back pain is more common in women than in men. A strained muscle is the commonest cause, and hormones, pregnancy and pelvic anatomy add more.
The ship of Theseus: the puzzle philosophers never settled
Replace every plank of a ship and is it the same ship? Philosophers have argued since Plutarch, and the same question now gets asked about people.
Two spoken languages leave a mark on the brain's grey matter
A Georgetown study found more grey matter in executive-control regions of Spanish-English speakers. Bilinguals of sign and speech showed no such gain.
A 360 record deal lets a label take more than record sales
A 360 deal gives a label a share of merchandise, touring and publishing income. Universal's contract for The Voice claimed 20% of the gross.
The Atlantic has had no hurricanes so far in 2026
A strong El Niño has kept the Atlantic free of hurricanes deep into its peak season, while the eastern Pacific runs unusually hot.
Patrick Mahomes returned from ACL surgery unbeaten
Patrick Mahomes tore his ACL in December, then threw three touchdowns in an overtime win nine months later. The Chiefs are 2-0 since his return.