SCIENCE ATLAS — HOW WE FOUND OUT
Humanity has answered this question differently for 2,000 years.
From where a question was born to the moment its answer was overturned — follow it on the map.
Pick a field and the people who carried its question line up across the map. The line itself shows how the centre of knowledge moved from the Mediterranean to Europe and across the Atlantic.
Or enter by period
0 places where a question was born. Look around, and follow the lineage of whichever one draws you.
Names and technical terms come later. Flip the card when you get curious.
Yet on a mountain it boils at ninety.
Air has weight. The whole column of it above us presses on the water, and boiling means overcoming that push. Higher up there is less air pressing, so water boils cooler. Torricelli worked it out by watching mercury in a glass tube stop at 76cm.
A monastery garden. Twenty-eight thousand pea plants.
Traits do not blend; they pass on whole, like grains. One can hide unseen for a generation and reappear in the next. Mendel counted peas for eight years to catch the rule in numbers. Nobody believed him while he lived.
The oldest standardised rainfall record anywhere.
In a farming country, rain was tax and survival. The old way was to dig after the rain and measure how deep the soil was wet — but sand and clay drink differently, so no two readings could be compared. Joseon handed out identical vessels nationwide and measured what collected in them. Running a country by numbers rather than by feel.
Measured with one well and one stick.
On the same day at the same hour, sunlight reached the bottom of a well in a southern city while a stick in Alexandria cast a shadow. A shadow means the two cities sit at different angles. That angle was one-fiftieth of a full circle, so fifty times the distance between them gives the Earth's circumference. He was within a few per cent.
Someone put it on a scale, and a theory fell.
Until then, burning was thought to release something called phlogiston — so ash should weigh less. But burnt metal weighed more. Lavoisier burned things in a sealed vessel and weighed the whole. The total did not change. Nothing had left; something from the air had joined.
Because nobody could, the moving Earth stayed unproven for three centuries.
If the Earth circles the sun, half a year later it stands on the opposite side of its orbit — and a nearby star should shift slightly against the background. Tycho Brahe hunted for that shift all his life and never found it, so he rejected the moving Earth. Bessel's angle was 0.314 arcseconds: a coin seen from a dozen kilometres. Tycho was not wrong. The stars really were that far.
Mothers attended by doctors died far more often than those attended by midwives.
Two wards in one hospital, with death rates differing several-fold. One difference: in the doctors' ward, mornings were spent dissecting corpses, and the same hands delivered babies. Semmelweis required hand disinfection and the deaths collapsed. Germs were still unknown. Unable to say why it worked, he was rejected by his colleagues and lost his post.
The heat from cooled coffee is still in the room. It just cannot be used.
Energy never disappears — but the usable form of it keeps shrinking. Clausius built a quantity to measure how spread out it is and called it entropy. That quantity never decreases on its own. Most physical laws run the same backwards; this one does not. It is why a film of a cup shattering looks wrong in reverse.
Two harmless things together, and the mouse died.
Pneumococcus came in a deadly encapsulated form and a harmless bare one. Killed deadly bacteria alone: nothing. Living harmless bacteria alone: nothing. Together, the mouse died — and living deadly bacteria were recovered from it. Something inside the dead had crossed over and changed the kind. What it was took sixteen more years. DNA.
Slide the coastlines together and they fit like a puzzle.
That the Atlantic's two coastlines resemble each other had long been noticed. Wegener piled up evidence: matching fossil species, strata that continue across, mountain ranges that line up. The continents, he said, had once been one and had drifted apart. The field pushed back hard — and not unreasonably, since he could not say what moved them. The answer came fifty years later, from the sea floor.
From a mark for an empty column to a thing you can add and subtract.
Several civilisations had a mark for an empty column. But a mark is not a number. Brahmagupta treated zero as a number that takes part in calculation: subtract a quantity from itself and you get zero; add zero and nothing changes; multiply by zero and you get zero. He set out negative numbers too, as debts. Division by zero was the one thing he could not settle.
Unfolded, 6.7 metres tall. Folded, the size of a book.
Joseon already had precise maps. The trouble was that you could not use them: large, hand-copied, and wrong wherever the copying slipped. Kim Jeong-ho cut the country into twenty-two strips that fold like screens, and cut them into woodblocks. Along the roads he put a dot every ten li, so counting dots gives the distance. The map stopped being an office's possession and became a traveller's.
Because the apple threw red away.
White light has every colour mixed in. The apple swallows most of them and spits back only the red it cannot take. The red we see is not what it has but what it refused. From that one question the series runs twelve pieces, to the dark night sky, the first light of the universe and black holes. No formulas.
An assumption forced in turned out to be true.
A blacksmith reads temperature from the colour of iron. Physics in 1900 tried to calculate that colour and got infinity. Assuming energy moves only in whole lumps fixed the sum — and the assumption turned out to be how the world is. Five pieces, each opening on the question the last one ended with.
You can know without measuring.
What the formulas you only memorised were actually saying. Pythagoras is a statement about areas, not lengths; logarithms were built to turn multiplication into addition. If the cards ask who found it, this series asks what it says.
The wrong theory worked for a while.
Not a parade of exploded theories. Why each was plausible, what it left behind, and what finally brought it down — usually not a better idea but a better instrument. Phlogiston, the aether, geocentrism, Lamarck: six pieces.
The film borrowed a real theory.
Not a place for checking a film's homework. Which theory did it borrow, and how was that theory turned into a story? Time runs slow beside something massive; watch that one fact become a scene. You need not have seen the film.
Exactly two: on, and off.
A computer is not a clever machine but a machine with a great many switches. Those switches hold numbers, take translated orders, become a machine for anything, learn what no one taught them, and wrap the Earth by way of the sea floor. From one switch to the data centre, and on to the quantum computer, in eleven pieces without a line of code.
It did not vanish. It got heavier.
The candle did not vanish; it joined the oxygen in the air, became an invisible gas, and grew heavier. Chemistry begins with the scale that caught this. Is there an end to cutting, why a pattern appears when elements are laid out, how atoms hold on — eight pieces without a formula or symbol.
More live in your mouth than people in a kingdom.
Three hundred years ago a Dutch cloth merchant looked at a drop of rain through a glass-bead lens and found it full of swimming things. They were between his teeth too. These tiny neighbours ripen kimchi and makgeolli, carry disease, share our meals in the gut, and made the air of the Earth. Eight pieces, each ending with one common myth corrected.
What brought them down was rarely a better idea — it was a better instrument
If the cards ask who found what, the library asks what it means. Each series asks in its own way.
The words the cards passed over, caught here. Under the precise line, what it actually amounts to.
So the person becomes interesting before the theory does. Strangeness is a clue, not a joke.