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TIL the jigsaw puzzle was commercialized around 1760 by John Spilsbury. His design took world maps, and cut out the individual nations in order for them to be reassembled by students as a geographical teaching aid.

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P6KL TIL about a Black man that convinced 200 Ku Klux Klansmen to leave the white supremacist group by befriending them
rRNay TIL that Aspartame (Diet Coke sweetener) is only bad for your health if you have a rare genetic disorder called Phenylketonuria (PKU)
neVb9 TIL Disney isn't legally allowed to develop Marvel attractions based on X-Men, Spider-Man, Fantastic Four, and the Avengers, and their "families" on its East Coast theme parks, nor use the Marvel name in both of its West/East Coast parks due to the 1994 contract Marvel signed with Universal Studios
E1Pk0 TIL in 2011, a write-in candidate for a board of education election needed only one vote to win, but she lost because she thought her friends/family would vote (they didn't) and was too busy at her son's baseball game to vote for herself.
YpKQP TIL that the Chevalier d'Éon (French diplomat and spy) lived 49 years as a male and 33 as a female.