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TIL The Bingham Canyon Mine in Utah is almost 4000 feet deep (that's 3X as tall as the Empire State Building). It's the largest man-made excavation and the deepest open-pit mine in the world. It's also visible to the naked eye from space.

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Ylnd TIL middle aged black men started visiting doctors less after news of the Tuskegee Syphilis Experiment scandal broke in 1972. This led to their life expectancy falling by 1.4 years, which accounted for “approximately 35% of the 1980 life expectancy gap between black and white men.”
x91o TIL in WWII the Russians trained dogs to run under German tanks with bombs on their backs. However, the tanks the dogs were trained to run under were Russian so they ended up running under the Russian tanks and blowing them up instead.
Me9pb TIL of Whittier, Alaska: A Community Under One Roof. It's a town that features a hotel and everyone in the community lives there and shares provisions. It's very hard to get to using a map and hard to enter considering that they physically block people out after a certain time.
GNlQ TIL in 1859 there was a coronal mass ejection so intense it shocked telegraph operators and set their equipment on fire.
GYmQE TIL of two-time Oscar-winner Glenda Jackson, who quit acting in 1992 to join the British parliament. She became a junior minister in the Blair government, and had aspirations to be Mayor of London. In 2015, at the age of 78, she quit politics, reverted to acting, and since won a Tony Award