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TIL European colonisation of the Americas killed 10% of world population

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QNxVp TIL of Locusta, a notorious ancient Roman serial killer and poisoner who lived during the 1st century AD. Renowned for her expertise in toxic substances, Locusta gained infamy by providing poisons to prominent figures, including Roman emperors. She was eventually executed by Emperor Nero.
epylE TIL They use helicopters to inspect high transmission power lines
4XZgo TIL that there is a Darth Vader 'Gargoyle' on the exterior of the Washington National Cathedral in Washington DC
OGZlY TIL that ​​the very first technical publication by famed Computer Scientist Donald Knuth ​​was the "Potrzebie System of Weights and Measures​". It measured Volume in ​'ngogn​', mass in ​'blintz', and time in ​units of 'clarke'​. It was published in of Mad Magazine in 1957, and earned him $25.
ep7ZD TIL extortion rings called "The Black Hand Society" were once found in major cities across America in the early 1900s, named for the distinctive signature often left on their threat letters - a hand imprinted or drawn in thick black ink.