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TIL of the Columbine Massacre (Not the Columbine you’re thinking of). On this day in 1927, a fight between Colorado State Police and unarmed striking coal miners led to machine guns being fired into the crowd of miners. Six miners were killed and dozens were injured.

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Oo547 TIL: In 1855 the mayor of Los Angeles, Stephen Foster, convinced a mob to not kill an accused murderer, but to try him in a court of law. When the accused man was acquitted, the mayor resigned and led a lynch mob to kill the man. He was re-elected a year later.
eg95 TIL that in the 1920’s a French surgeon became famous for his practise of grafting monkey testicles on to male testicles. Hundreds, including the rich and famous, underwent the procedure for its supposed rejuvenating effects.
ep4w4 TIL that Mae Jemison, the first African-American woman in Space, was so inspired by Nichelle Nichols' portrayal of Lieutenant Uhura on Stark Trek that she began every shift of her 1992 Shuttle mission by radioing "Hailing Frequencies Open" as a tribute to the actress and her character.
wyW6 TIL of “resiniferatoxin”, a naturally occurring chemical that is 7273 times hotter than any pepper in the world, and 1000 times hotter than pure capsaisin. It books in at 16 trillion Scoville units
Kgr9 TIL it snows metal on Venus