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TIl the Elo rating system, a method to calculate the relative skill level of players in different competitive games, originated from two player games such as chess and its creator Arpad Elo.

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rlkx TIL the reason the background clouds, hills etc. have eyes in the Super Mario games is because they used to be Mushroom People (toads) and were transformed by Bowser’s magic. The pipes and bricks that you destroy used to be Mushroom People too.
Ypk97 TIL an 11 year old girl survived four days at sea in a 2ft by 5ft raft after her family was murdered and the boat she was on sank. She went years without knowing for sure who killed them.
Yw7G TIL: Humidity levels can rise in the summer through “Corn Sweat” which is water evaporating from corn plants
4X7bb TIL author Clive Barker supported himself early in his career by occasionally working as a male prostitute for rich and secretive clients. The experience inspired him to write, "The Hellbound Heart", which was later adapted into the film, "Hellraiser"
EgMmp TIL that in 1999, PETA, as part of its McCruelty campaign, attempted to distribute bloody Unhappy Meals to young audiences. They also released a comic book in which Ronald McDonald, Grimace, and the Hamburglar unite to kill Birdie's parents, feed them to her unknowingly, then eat her as well.