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TIL Japan’s Unit 731, during WWII infected prisoners with tiger blood, anthrax and other diseases/viruses, amputated limbs without anesthesia and tested weapons on live prisoners. The research notes were given to the US in exchange for immunity post war…

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07J1 TIL In 2004, a hacker from Germany revealed Half Life 2’s source code andValve tried to arrest him by getting him to come to the states for a fake interview.
9jBG TIL that British spies used semen as invisible ink during WWI. The method was invented by Captain Sir Mansfield Cumming.
5L7n TIL astronauts vote from space
b9Jk4 TIL in 1970, a pizzeria owner tried to catch the Zodiac Killer by filming a movie about him and hosting a premiere party in San Francisco, in the hope that the actual killer would show up to see it
E1AjX TIL about the Brooklyn Theater Fire in which none of the staff or actors yelled "Fire" because they were afraid of causing a panic and 278 people died.