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TIL China tried to pass off footage from the movie ‘Top Gun’ as footage of their air force

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9BE7 TIL The Iron Maiden, a medieval torture device, never actually existed for that purpose. It was created by a museum curator when he added spikes to a female form sarcophagus.
lokbr TIL about the city of Cahokia; a Native American (Mississippian) city built on the Mississippi which had over 140 hand-built earthen mounds, more people than contemporaneous London, a copper smelting workshop and 5 concentric circles of posts which line up with the sun on equinoxes and solstices.
LkO5r TIL there are thousands of U.S. areas affected by high levels of lead that are worse than Flint, Michigan
rRAV1 TIL that although considered one of the most toxic animals on earth, if a poison dart frogs is raised in captivity will never develop venom. This is likely because they assimilate plant poisons which are carried by their prey.
5o8B TIL that after needing 13 liters of blood for a surgery at the age of 13, a man named James Harrison pledged to donate blood once he turned 18. It was discovered that his blood contained a rare antigen which cured Rhesus disease. He has donated blood a record 1,000 times and saved 2,000,000 lives.