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TIL before people knew the full extent of x-rays, women would get face x-rays in order to kill bacteria which would make skin look healthy and beautiful. After a while people who did this started developing tumors on their faces and some even died. Doctors also used this method for hair removal.

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7MPZ TIL that a secret soviet intelligence agent is primarily responsible for thwarting Operation Long Jump, concocted by Adolf Hitler, which was an attempt to assassinate Stalin, Churchill, and Roosevelt at the Tehran conference in 1943. This might be responsible for saving the world.
4Eva TIL that a scientific study concluded that Cow Tipping is impossible and an urban legend. Cows are hyper-aware of their surroundings and it takes 2,910 newtons of force to topple them over. They also sleep lying down.
EgOPw TIL that in some parts of Ruhr region (Germany) the ground has sunk by up to 30m (12m in average) due to exzessive mining in the region. The homes of millions of people would be flooded if the pumps were stopped to keep the groundwater level artificially low. These pumps have to pump forever.
gRy7 TIL That when Napoleon was asked whether he wanted to be God, He thought it over and replied, ‘No, it’s a dead-end job.’
OoDJ1 TIL Bonobos form all-female coalitions to target violent males as a counterstrategy against harassment.