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TIL the world's largest dam is so big that NASA scientists calculated that shift of water mass stored by the dams would slow down earth's rotation and increase the length of the earth's day by 0.06 microseconds.

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epEQD TIL that any shape made entirely of straight lines can be made from a folded piece of paper and a single straight cut. (Fold and cut theorem) (VSauce short)
VMO7Q TIL Happiness and life satisfaction among United States adolescents, which increased between 1991 and 2011, suddenly declined after 2012. By 2016-17, both adults and adolescents were reporting significantly less happiness than they had in the 2000s.
ANlNx TIL there are 8 varieties of McDonalds ketchup from most bland to most vinegary and they can be identified by the number on the packet
v1gNr TIL that Split-brain syndrome is a disconnection of the left and right brain hemispheres produced by Corpus callosotomy(a surgical epilepsy treatment). This results in both brain hemispheres acting and perceiving things differently.
J1A0Q TIL about the Teddy bear toss, a popular Christmas season promotion at junior ice hockey and minor league hockey games. Fans are encouraged to bring teddy bears and throw them on the ice when the home team scores its first goal. The toys are gathered donated to hospitals and charities.