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11,491 facts. Click any fact to see its full page.
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📜 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
The event horizon of a black hole is the boundary beyond which nothing, not even light, can escape.
Binary star systems, where two stars orbit each other, are more common in the universe than single stars like our Sun.
Olympus Mons on Mars is not only the tallest volcano in the solar system but also has a base the size of Arizona.
The Hubble Space Telescope has made over 1.5 million observations since its launch in 1990.
Venus has over 1,600 major volcanoes, more than any other planet in the solar system.
The tallest cliff in the solar system is Verona Rupes on Uranus's moon Miranda, standing about 12 miles high.
A quasar can emit more energy than an entire galaxy containing billions of stars.
Mercury has ice at its poles despite surface temperatures reaching 800 degrees Fahrenheit, because deep craters never see sunlight.
The James Webb Space Telescope can detect the heat signature of a bumblebee on the Moon.
Some black holes spin at nearly the speed of light, warping space-time around them.
The farthest human-made object from Earth, Voyager 1, carries a gold-plated copper disk with greetings in 55 languages.
Pluto has a heart-shaped nitrogen ice glacier on its surface called Tombaugh Regio.
The Karman line, at 62 miles above sea level, is the internationally recognized boundary between Earth's atmosphere and outer space.
There is a supermassive black hole at the center of nearly every large galaxy, including the Milky Way.
The Sun makes up about 99.86% of the total mass of the entire solar system.
The average density of Saturn is less than that of water — about 0.69 grams per cubic centimeter.
Astronauts report that space smells like seared steak, gunpowder, and raspberries due to dying stars releasing ethyl formate.
The Voyager Golden Record contains sounds and images from Earth, intended as a message for any extraterrestrial civilization that might find it.
Saturn's moon Mimas looks almost identical to the Death Star from Star Wars due to a massive impact crater.
If you could fold a piece of paper 103 times, it would be thicker than the observable universe.
The Fermi Paradox asks why, given the high probability of extraterrestrial civilizations, we have not yet detected any signs of intelligent life.
Languages die at a rate of about one every two weeks, and by 2100, nearly half of all current languages may be extinct.
The word 'strengths' is the longest word in the English language with only one vowel.
English has borrowed words from over 350 other languages.
The word 'trivia' comes from the Latin word for 'three roads,' referring to information found at crossroads.
Whistled languages, used in mountainous regions, can carry messages over distances of up to 5 miles.
The word 'goodbye' is a contraction of the phrase 'God be with ye.'
There are at least 50 different words for snow in the Inuit languages.
The shortest complete sentence using every letter of the alphabet is 'The five boxing wizards jump quickly.'
About a new word is added to the English language every two hours, roughly 4,000 new words per year.
The word 'bookkeeper' is the only unhyphenated English word with three consecutive double letters.
Onomatopoeia — words that imitate sounds — vary between languages. In English, dogs say 'woof,' in Japanese 'wan,' and in Korean 'meong.'
The Pirah language, spoken by an Amazonian tribe, has no words for specific numbers or colors.
The longest word without a repeating letter is 'uncopyrightable.'
Japanese has three writing systems — hiragana, katakana, and kanji — often used together in the same sentence.
The word 'queue' is the only English word in which removing the last four letters does not change its pronunciation.
There are over 200 artificial languages that have been created, but Esperanto is the most widely spoken.
The word 'nerd' was first coined by Dr. Seuss in the book 'If I Ran the Zoo' in 1950.
The most common letter in the English language is 'E,' appearing in about 11% of all words.
Agglutinative languages like Turkish and Finnish can express entire sentences as a single word by stacking suffixes together.
The word 'set' has the most definitions of any word in the English language, with over 430 listed in the Oxford English Dictionary.
The yo-yo is one of the oldest toys in the world, with origins in ancient Greece around 500 BC.
Vincent van Gogh sold only one painting during his lifetime — 'The Red Vineyard' — for about $2,000 in today's money.
The world record for the most people simultaneously hula hooping is 2,290.
The first published crossword puzzle appeared in the New York World newspaper on December 21, 1913.
The superstition of Friday the 13th being unlucky has a name — paraskevidekatriaphobia.
The birthday song 'Happy Birthday to You' was originally titled 'Good Morning to All' and was written by two sisters in 1893.
The Louvre Museum in Paris has over 380,000 objects and displays about 35,000 works of art.
The first Olympic Games in ancient Greece in 776 BC had only one event — a sprint of about 192 meters called the stadion.
The average person spends about six months of their lifetime waiting in line.