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Photograph it low over the rooftops, then high overhead: the same size to the pixel. So why does it look twice as big as it rises?
Film yourself moving your eyes: the camera catches them sliding. You never do. The gap in your vision has a name, and it lasts a fraction of a second.
The silence isn't fear. Birdsong answers to light, and four minutes of artificial night are enough to derail the clock that triggers it.
Stare at a red square for thirty seconds, look at a white wall: a green ghost appears. Not general fatigue, not a trick of the wall, the culprit is elsewhere.
A baby learns to walk, to talk, to recognise its mother. And yet, as an adult, it will recall none of those moments. The culprit isn't forgetting.
Not 100, not 400, not a round figure from our decimal system. The way we split the circle comes from a people who counted on their fingers in a curious way.
Their eyes don't make light. Behind the retina hides a small mirror that gives light a second chance.
You pass young pigeons every week without knowing it. The reason comes down to a cliff-side nest and a few weeks of patience.
Three hearts, copper instead of iron, and one heart that stops the moment it swims. The octopus solved a problem our own blood gets around another way.
The longest day falls on 21 June, but the hottest comes in late July. The same lag that makes four in the afternoon hotter than noon, stretched across a whole summer.
The poisoner legend doesn't hold up. The real role of that little clink is older, more human, and it explains why we look each other in the eye.
For ages, people hunted for the source of that rumble: they suspected the blood, a hidden organ. The real source sits in a throat smaller than a walnut.
Roland Garros crossed the Mediterranean non-stop in 1913 and never held a racket. The 1928 stadium took his name because a former classmate made it a condition.
In 1960, a Norwegian couple lifted the turf of a Newfoundland shore and found Scandinavian rivets. A solar storm trapped in tree rings dates the camp to AD 1021.
The dawn chorus peaks right at the edge of daylight. Too dim to hunt insects, the birds sing first and eat later, and the females are listening.
Place electrodes on the throat of a silent reader and you pick up tiny contractions near the vocal cords. Reading is an act of speech turned inward.
The asteroid Eros looks like a grey peanut, Itokawa like a battered potato. Below roughly 500 kilometres across, a body's gravity never gets the last word.
In the autumn of 1789, the deputies split over the king's right of veto and sat either side of the chair. The seating plan of one room became a vocabulary.
European autumns lean yellow while Vermont and Quebec catch fire in red, and the difference is not the weather but which species build the pigment.
Around 1.2 million years ago the human lineage lost its fur, but not the tiny muscle under each hair that used to lift it. It still fires, on bare skin.
Write a letter on a transparent sheet and press it to the glass. Nothing shifts left or right. The only axis a mirror flips is the one running from you to it.
The star hasn't moved: it's the air between you and it that dances. Astronomers call it seeing, and they escape it by climbing mountains or leaving the atmosphere.
A wolf trampled the grass flat and turned its nose into the wind before sleeping. The dog repeats the same circle on a parquet floor where none of it applies.
You hear yourself in intimate stereo and come out in mono: bone conduction adds several decibels in the low frequencies a microphone never picks up.
Seawater holds about 35 grams of salt a litre, the Baltic under 10, the Dead Sea more than 340. Each sea keeps what the rivers bring and the Sun leaves behind.
April 1 sits just after the sign of Pisces, Lent ends around then, and every generation adds a layer: the paper fish, the fake newspaper, now the fake tweet.
Ask people to date an event and they shrink the past: five years ago feels like three. By the oldest explanation's arithmetic, half a subjective life ends at eight.
A fungus builds its cell walls from chitin, like a lobster shell, and the largest living thing known on Earth is one of them, 965 hectares of it in Oregon.
Fish yawn, and so do reptiles and birds, but only a handful of social species catch someone else's yawn: apes, geladas, dogs, wolves, zebrafish.
Between three and four, a child asks more than a hundred questions an hour. Not to hold your attention: it's the same verification tool a scientist uses.
Seven wandering lights in the Babylonian sky, one hour and one day for each. Constantine made the count official across the Empire by edict on 7 March 321.
Night is not truly dark: radio telescopes pick up a glow in every direction, the light of the young universe stretched by expansion beyond what our eyes can see.
The tallest tree known, a Californian redwood named Hyperion, stands at 115.9 metres, and its exact location is kept secret by park rangers.
The cloud is a ventilated concrete warehouse in Oregon, Ireland or Singapore, and the biggest ones draw more than 600 megawatts, the power of a mid-sized city.
