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.
kind archive
Explainer.
Every explainer in the edition.
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.
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.
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.
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.
Ransomware: the four checks before a company pays
The National Cyber Security Centre says the choice to pay is the victim's. Payment buys no certainty, as attackers can still sell the data.
Patent trolls make money by threatening suits, not products
A patent troll buys patents it never uses, then threatens costly lawsuits until targets pay. IP Nav says its fees topped $700m.
A World Cup red card brings a one-game ban with no appeal
A red card sends a player off and brings an automatic one-game ban. At the 2026 World Cup that ban could not be appealed, only made longer.
Instagram's Restrict cuts someone off without telling them
On Instagram, Restrict hides a person's comments from others and moves their messages to requests. They stop seeing when you are online and are never told.
Your IP address gives away your provider, not your street
An IP address identifies your device to every site you visit, and reveals your provider and a rough location, never an exact one.
A dead whale feeds the seafloor for a century
Sharks, hagfish and bone-eating worms work through a sunken whale for 30 years or more. A stranded one can explode before anyone moves it.
Cables, rug edges and corners: why a robot vacuum gets stuck
Robot vacuums tend to stall on the same few things: loose cables, raised rug edges, thick carpet and dirty sensors. Better navigation helps, but only so far.
A grandmaster's chess memory relies on patterns, not pieces
Grandmasters recall real chess positions at a glance because they store patterns, not pieces. Scramble the board and the advantage all but vanishes.
Cold feet on ice: why a duck lets its toes chill
A duck's feet run close to the temperature of the ice. Blood vessels in its legs swap heat, so the body stays warm and the feet never freeze solid.
Eye twitches: the usual causes, and when to see a doctor
Most eyelid twitches are harmless muscle spasms linked to short sleep, caffeine, and stress, say the Cleveland Clinic and the National Eye Institute.
Will AI replace lawyers? Trainees are the first to feel it
A Harvard Law School centre reports AI cutting junior legal roles, yet the US Bureau of Labor Statistics still forecasts 4% growth in lawyer jobs.
A film tax credit can decide where a film is shot
A film tax credit refunds a slice of what a production spends, often about 20%. That refund can decide where a film is made, and places without one lose out.
Canada's and Britain's new wealth funds run on debt, not surplus
The Canada Strong Fund and Britain's National Wealth Fund run on borrowed money, where Norway's runs on oil. Critics call Canada's a costly bet.
Encryption hides what you say, not who you said it to
End-to-end encryption stops a provider reading your words, but it still knows who messaged whom, when, and how the chat moved.
Dollar reserve status is worth the US an estimated $18 trillion
A National Bureau of Economic Research paper says losing reserve status would cut the dollar's value 8.8% and lift US real interest rates 0.9 points.