Science
Discover facts about science. Small discoveries that change the way you see familiar things.
Science
When a French abbot shocked 700 monks at once
When the Leiden jar discharged, monks holding hands made one long path for the electricity. The shock raced through that connected chain nearly at once, so…
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How a spinning gear measured the speed of light
Fizeau turned a spinning gear into a stopwatch for light. He sent a beam through a gap toward a distant reflector; on its return, the rotating gear had either…
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A blue sky is sunlight arriving from the wrong direction
Air molecules scatter shorter-wavelength light more strongly than longer-wavelength light. That sends blue light toward you from across the sky instead of…
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Einstein's rival mistook heated walls for cosmic aether
Miller’s interferometer was built to detect tiny shifts in light, but temperature could shift the instrument itself or the air along the light paths. That…
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Defining chaotic fluid dynamics with a tiny stream of dye
A thread of dye can stay neat in gently moving water because viscosity damps little disturbances. Speed the water up, and eddies begin pulling the color into…
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A wrong assumption magnified America's biggest nuclear test
The 1954 Castle Bravo test yielded 15 megatons, far above the predicted six. Scientists had underestimated how lithium-7 in the fuel would react under the…
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A two-part flash became a Cold War nuclear mystery
In 1979, a Vela satellite detected the characteristic double flash associated with a nuclear explosion over the southern oceans. Investigators disagreed over…
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The scientist who fed the world and armed poison gas
Haber's ammonia process cracked a difficult problem: nitrogen in the air is plentiful, but plants cannot use it in that form. Combining it with hydrogen makes…
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Sixteen horses lost a tug-of-war with a vacuum
The hemispheres weren’t glued together; the surrounding atmosphere was pushing them together. Removing much of the air inside left too little outward pressure…
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How a spinning gear measured human hearing
A card held against a spinning toothed wheel turns each tooth into a tiny tap. Slow the wheel and the taps sound like clicks; spin it faster and your ear…
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Sea ice can grow a garden out of water vapor
Frost flowers form when water vapor deposits directly as ice crystals on a very cold surface. On young sea ice, the delicate branching shapes can also collect…
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When scientists mistook darkness for new radiation
N-rays were so faint that scientists had to judge tiny changes in brightness—and expectation can nudge what a person thinks they see. In one test, researchers…
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The artist who revealed the brain's individual cells
Brain tissue can look like a forest of branches all growing into one another. Cajal’s drawings teased out the separate neurons and showed that they stop short…
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Radioactivity was discovered on a cloudy day
Becquerel kept uranium beside photographic plates wrapped to block light. The plates darkened anyway, so sunlight couldn’t take the blame: the uranium was…
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The coelacanth has an electrical sensor in its snout
A gel-filled rostral organ helps this deep-water fish detect weak electrical signals. That offers clues to nearby prey when vision alone is limited. A fish…
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The scientist who needed a spotless lab to date Earth
Lead was the problem: a speck of it could swamp the tiny isotope differences Clair Patterson needed to measure. He made his lab exceptionally clean so the…
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Some famous hot springs are naturally radioactive
Some hot springs pick up radon from the rocks below. Radioactive elements in those rocks can produce the gas, which dissolves into groundwater and may rise…
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Lise Meitner explained fission on a winter walk
Meitner and Otto Frisch realized that a uranium nucleus could split into two smaller nuclei. Using Einstein’s equation, they saw that the pieces weighed…
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How mercury helped prove Boyle's Law
In Boyle’s experiment, a column of heavy mercury pressed down on trapped air, squeezing it into less space. With temperature held roughly steady, twice the…
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The silent whistle tested on zoo animals
The whistle was adjustable: Galton could raise or lower its pitch, then use his walking stick to test what different animals could hear. Humans couldn’t hear…
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The camera that froze an insect's flight with sparks
A fast insect would smear across a photograph during a long exposure. A brief spark lit it for just an instant, freezing one clear position as if the flash…
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X-rays gave the periodic table a better order
Henry Moseley's measurements in 1913 and 1914 linked each element's X-ray frequencies to its atomic number. That gave the table a physical ordering principle…
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A drop of liquid metal can beat like a tiny heart
Researchers have made gallium droplets repeatedly spread and contract using an applied voltage in a surrounding liquid. Electrical and chemical changes at the…
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How Hertha Ayrton explained ripples in beach sand
As waves move across a beach, they push grains back and forth. That motion builds ridges at right angles to the waves, rather than parallel to them. Hertha…
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