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11,491 facts. Click any fact to see its full page.
All 11,491
📜 History 1,991
🔬 Science 1,964
🐾 Animals 1,525
🚀 Space 977
🧠 Psychology 893
🌿 Nature 759
💻 Technology 735
🌍 Geography 599
🎭 Culture 581
🫀 Human Body 572
🌊 Ocean 373
💬 Language 245
🍕 Food 199
✨ General 68
✨ Dinosaur 10
A group of hedgehogs is called an array.
Velvet worms are considered living fossils — they hunt by spraying sticky slime from their heads.
The electric eel can generate 600 volts — enough to stun a horse.
Voyager 2 is the only spacecraft to have visited Uranus and Neptune — flying past in 1986 and 1989.
The 2004 Indian Ocean tsunami was detected by GPS satellites — revealing ground displacement across thousands of km.
The Apollo missions brought back 382 kg of lunar rock — still being studied today.
The James Webb Space Telescope has observed galaxies that formed just 300 million years after the Big Bang.
The Opportunity rover found evidence that ancient Mars had liquid water — in sulfate-rich rocks.
Magellan mapped 98% of Venus's surface with radar — revealing a world covered in lava plains and volcanic features.
The Chandra X-Ray Observatory has observed the hottest, most energetic events in the universe for over 20 years.
The solar wind discovered by Eugene Parker in 1958 was confirmed by the Mariner 2 mission in 1962.
The WISE telescope discovered 33,000 previously unknown asteroids and 19 comets.
Mars Reconnaissance Orbiter has returned more data than all other interplanetary missions combined.
The Spitzer Space Telescope observed the universe in infrared — revealing star-forming regions hidden by dust.
The first gravitational wave detection in 2015 confirmed a prediction Einstein made 100 years earlier.
The Event Horizon Telescope is a planet-sized radio dish — an array of observatories across Earth synchronized to act as one.
The Hubble Ultra Deep Field image (2004) shows 10,000 galaxies — in a patch of sky smaller than a grain of sand held at arm's length.
TESS (Transiting Exoplanet Survey Satellite) has identified 6,400+ exoplanet candidates since its 2018 launch.
The Kepler space telescope found over 2,600 confirmed exoplanets during its 9-year mission.
The Mars Phoenix lander confirmed water ice in the Martian soil in 2008.
New Horizons revealed Pluto's complex geology — mountains, glaciers, and atmospheric hazes.
The Parker Solar Probe has 'touched' the Sun — entering the solar corona, closer than any previous spacecraft.
The Deep Impact mission fired a 370 kg copper impactor into Comet Tempel 1 at 10 km/s.
The Stardust mission collected comet particles from Comet Wild 2 in 2004 and returned them to Earth.
The Dawn spacecraft orbited both Vesta and Ceres — the first mission to orbit two extraterrestrial bodies.
Juno discovered that Jupiter's interior is 'fuzzy' — with a diffuse, extended core rather than a compact one.
The Cassini spacecraft found that Enceladus has the chemistry for life — hydrogen, carbon dioxide, and organics in its geysers.
Chandrayaan-1 confirmed water ice at the Moon's poles in 2009 — a surprising finding with implications for lunar habitation.
The Lunar Reconnaissance Orbiter has photographed the Apollo landing sites — the equipment is still visible.
Mars Express has been orbiting Mars since 2003 — and found evidence of a subglacial lake in 2018.
The MESSENGER spacecraft mapped Mercury in detail — finding ice in permanently shadowed polar craters.
The Galileo spacecraft dropped a probe into Jupiter's atmosphere in 1995 — surviving for 57 minutes before being crushed.
The first close-up images of Jupiter were sent by Pioneer 10 in 1973 — after a journey of 21 months.
The autocomplete function on smartphones has changed how people write — with measurable effects on vocabulary.
Newspapers existed in China as early as the 8th century — written on silk, available only to the imperial court.
Typewriters led to an unexpected social revolution — requiring skilled operators, they opened office work to women.
Braille was invented in 1824 by Louis Braille at age 15 — a student at the National Institute for Blind Youth in Paris.
The Dewey Decimal System, devised in 1876, organized books by subject — still used in libraries worldwide.
The first published scientific journal was the Philosophical Transactions of the Royal Society — in 1665.
The quipu of the Inca — knotted strings — recorded numerical and possibly narrative information without true writing.
Shorthand writing systems date to ancient Rome — Tiro's system was used to record Cicero's speeches.
The invention of the paperback book in 1935 by Penguin made books affordable for the masses.
The spread of printing in 15th-century Europe produced the Reformation — allowing Luther's ideas to spread instantly.
The Mayan writing system is a logo-syllabic script — using both logographic and phonetic elements.
The Linear B script of Mycenaean Greece was deciphered in 1952 — by Michael Ventris, an amateur.
Ancient Sumerian tablets record the world's oldest known written story — the Epic of Gilgamesh.
The Voynich manuscript, written in an unknown script, has never been deciphered — over 600 years after it was made.
The first emoji set was 172 characters — created by Shigetaka Kurita for i-mode mobile internet in 1999.
The first spam email was sent in 1978 — advertising DEC computer systems to 393 people on ARPANET.
Text messaging in China uses pinyin romanization with autocomplete — fundamentally different from alphabetic texting.