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TIL the Romans had a sacrificial "door to the underworld" in modern day Turkey where animals would appear to mystically drop dead. The eunuch priests that brought them there were left unscathed because they stood above the lethal cloud of carbon dioxide gas.

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JYa5B TIL that your anus and rectum are lined by the same type of tissue as your mouth, which explains why your poop can burn
NrmM TIL a 67-year-old lived his entire life stereoblind, or unable to properly experience depth perception, until he went to a theater and saw Hugo in 3D. He was blown away by the experience of depth during the movie, and afterward the ability stayed, curing him of his condition.
E5Nd TIL that mustard gas led to chemotherapy. During a World War II air raid, German pilots hit an American ship which had a secret stockpile of mustard gas. Doctors noticed that the gas suppressed cell division, which could fight cancer.
oBENL TIL on the Carol Burnett Show, they would frequently do two takes of every skit. One done as it was written, and then again with Tim Conway being allowed to include his bizarre ad-libs such as having a Hitler handpuppet sing, or telling a story about Siamese Twin elephants connected at the trunk.
49r5 TIL every time Pac-Man eats a regular dot, he stops moving for one frame (1/60th of a second), slowing his progress by roughly ten percent—just enough for a following ghost to overtake him.