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1,991 facts in History. Click any fact to see its full page.
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Marie Curie's experiments on radioactivity were done without knowledge that radiation was harmful — she died from aplastic anemia.
The Hawthorne effect — people behave differently when observed — was discovered during productivity studies in the 1920s–30s.
The Tuskegee Syphilis Study (1932–72) left 399 Black men untreated after penicillin became available — a major ethical scandal.
Benjamin Franklin's kite experiment demonstrated lightning is electrical — setting the stage for the invention of the lightning rod.
The Stanford Prison Experiment (1971) was halted after 6 days when 'guards' became abusive — though later criticized for methodological flaws.
Both the Aztec and Inca empires were destroyed within 50 years of European contact — primarily through disease.
The Inca conducted extensive road-building campaigns using mit'a — a form of labor tax paid in work.
The Inca built suspension bridges across Andean gorges — some were hundreds of meters long.
Aztec women could own property, testify in court, and practice medicine — unusual for their time.
The Aztec 52-year calendar cycle was marked by the New Fire ceremony — a terrifying time when the world might end.
Aztec society was highly stratified — warriors who captured enemies could advance in status.
The Inca worshipped the sun god Inti — gold represented the 'sweat of the sun.'
Francisco Pizarro conquered the Inca Empire with just 168 men — helped by European diseases that had preceded him.
The Inca used relay runners (chasquis) to carry messages 2,400 km in under a week.
Machu Picchu was likely an estate for the Inca emperor Pachacuti — built around 1450 AD.
The Inca practiced trepanation (skull drilling) with survival rates comparable to early 20th century surgery.
The Inca Empire stretched 4,300 km from modern Colombia to Chile — the longest empire in the Americas.
Inca mummies of sacrificed children have been found perfectly preserved on Andean peaks at altitudes over 6,000 meters.
The Inca used a knotted string system called quipu to record data — still not fully decoded.
The Inca built 40,000 km of roads through the Andes — without wheeled vehicles or horses.
Aztec medicine included herbal remedies, surgeries, and knowledge of anesthesia using plants like datura.
Aztec markets like Tlatelolco impressed Spanish conquistadors — they rivaled the best markets in Europe.
The Aztec writing system combined logograms and phonetic symbols — still partially undeciphered.
Hernán Cortés conquered the Aztec Empire with only 600 men — aided by local allies, disease, and political divisions.
The Aztec Triple Alliance rapidly expanded from 1428 — within 90 years it controlled much of Mesoamerica.
Aztec warriors captured prisoners for sacrifice rather than killing them in battle — limiting tactical efficiency.
The Aztec calendar was so accurate it could predict solar eclipses — more precise than contemporary European calendars.
Aztec chocolate (xocolatl) was a bitter, spiced drink — far removed from the sweet version we know today.
The Aztecs played a ball game (Ullamaliztli) where the losers — or winners, accounts differ — were sometimes sacrificed.
The Aztec capital Tenochtitlan was built on an island in a lake — it had a population of 200,000 in 1500.
The most powerful earthquake ever recorded was the 1960 Valdivia earthquake in Chile at magnitude 9.5.
The world's oldest university in continuous operation is the University of Bologna — founded in 1088.
The world's oldest recorded recipe is for beer — inscribed on a Sumerian clay tablet around 1800 BC.
Archaeological evidence shows early humans cared for disabled and injured individuals — demonstrating ancient empathy.
Early human groups routinely interacted and traded across hundreds of kilometers — as shown by material culture exchange.
Genetic evidence shows that Native Americans have some Australasian ancestry — a poorly understood prehistoric migration.
The migration to the Americas occurred in multiple waves — the last major wave around 15,000 years ago via the Bering land bridge.
Cave paintings in Indonesia date to at least 45,000 years ago — making them among the oldest known representational art.
Ancient humans used plant medicines — Neanderthal dental calculus contains yarrow, which has anti-inflammatory properties.
Homo sapiens reached Europe around 45,000 years ago — and Neanderthals disappeared shortly after.
Burial of the dead with objects — indicating belief in an afterlife — dates back at least 100,000 years.
Hunter-gatherers were not solely meat-eaters — most calories came from gathered plant foods.
The Toba catastrophe theory suggests a volcanic winter 74,000 years ago nearly wiped out the human lineage.
Skeletal evidence shows early humans were taller than later agriculturalists — farming produced shorter, less healthy people.
The Clovis people, once thought to be the first Americans, arrived after earlier peoples now documented at multiple sites.
The first evidence of organized warfare dates to about 13,000 years ago — at a site in Sudan.
The agricultural revolution began independently in at least 11 different locations around the world.
Anatomically modern humans reached Australia by 65,000 years ago — this required crossing open ocean.
Early humans may have outcompeted Neanderthals through larger social networks — not necessarily greater intelligence.
Homo floresiensis — 'the Hobbit' — was a tiny hominin found on the Indonesian island of Flores, going extinct only 60,000 years ago.