Science
Discover facts about science. Small discoveries that change the way you see familiar things.
Science
The first nuclear reactor hid under Chicago bleachers
In 1942, scientists built Chicago Pile-1 beneath the University of Chicago's football stands. Graphite slowed the neutrons released by splitting uranium…
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Why wintergreen mints spark in the dark
Biting cracks sugar crystals and separates electrical charges, producing a tiny spark. Wintergreen oil catches some of the spark’s ultraviolet light—normally…
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A crossbow helped Charles Vernon Boys measure gravity
Boys used a crossbow to draw heated quartz into exceptionally fine fibers. A suspended mass could twist one of these threads under an extremely small force,…
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How pig bladders helped reveal osmosis
A pig bladder acts like a selective gate: water can pass through, while larger molecules are held back. Water moves toward the more concentrated alcohol…
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She helped show why twice the speed means four times the energy
Émilie du Châtelet defended the idea that motion’s capacity to do work scales with speed squared. Double an object’s speed and its kinetic energy rises…
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Price's equation separates evolution into two kinds of change
One term tracks how a trait is associated with reproductive success; another tracks changes as traits pass between generations. That general bookkeeping can…
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The tree that fooled a scientist about where wood comes from
Van Helmont saw his willow gain weight while the soil barely changed, and guessed that water had become wood. The missing ingredient was carbon dioxide:…
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How a nuclear test sparked Japan’s tuna panic
The fallout landed on a fishing boat, so the danger arrived with the catch—not as a distant cloud but as food headed for market. The crew developed radiation…
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Microbes are eating Venice's ancient stone
The film on Venice’s stone and glass is alive, and its microbes can chemically alter the materials beneath them. As they grow, those changes gradually weaken…
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Chemicals can grow rings like trees
A chemical front moves through a gel, and diffusing chemicals react as they meet. When their concentration reaches a threshold, they leave a solid band; the…
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Mathematical symmetry dictates universe survival
If the laws of physics work the same tomorrow as today, energy is conserved. If they work the same here as a few steps away, momentum is conserved. Noether's…
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Birds may prefer a giant fake egg
Some birds react more strongly to an oversized or unusually vivid fake egg than to a real one. The fake turns up a feature the bird already notices, like size…
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Lakhovsky built a medical promise out of radio-like rings
His multiple-wave oscillator used concentric open metal rings and was promoted through a theory that living cells could be influenced by electromagnetic…
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A jet of shampoo can ride on a film of air
In the Kaye effect, a falling stream can slide across a pool and shoot back out instead of merging immediately. A 2013 experiment identified a very thin…
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Wu's experiment showed nature can distinguish left from right
Chien-Shiung Wu and her colleagues cooled cobalt-60 and aligned its nuclei. Electrons from its radioactive decay favored a direction relative to nuclear spin,…
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How Victorians made electricity with spinning disks
A Victorian electrostatic machine used spinning disks to separate electrical charge. Oppositely turning disks helped build up charge on metal sectors, and…
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The astronomer who called colleagues 'spherical bastards'
Zwicky’s “spherical” insult meant his colleagues were bastards from every direction. He also noticed a serious cosmic mismatch: galaxies in the Coma Cluster…
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A vibrating string can have points that never move
When waves traveling along a string meet, they can cancel at certain points called nodes while the sections between them vibrate. The pattern is a standing…
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Satellites saw the ozone hole before scientists did
Satellites recorded very low ozone over Antarctica, but automated checks rejected the readings because they looked too far outside the expected range.…
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Why Brownian motion can’t power a perpetual-motion machine
A ratchet seems like it should turn random jostling into one-way motion, but the pawl—the catch that blocks backward movement—gets jostled too. The same heat…
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The ghostly glow that clings to ship masts
St. Elmo’s fire is air glowing around a pointed object, not a flame eating its way up a mast. A strong electric field energizes nearby air until it gives off…
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A solar storm once made telegraph wires spark
During the 1859 Carrington Event, a severe geomagnetic disturbance induced currents in long telegraph lines. Operators reported sparks and equipment behaving…
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The squid nerves behind a famous circuit
A Schmitt trigger gives a wavering signal two thresholds: one to switch on and a different one to switch off. That gap stops tiny electrical jitters from…
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Hubble wasn't the first to find evidence of expansion
Slipher noticed that many galaxies’ light arrived shifted toward red, like a sound changing as its source moves away. But redshift alone wasn’t the whole map:…
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