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TIL ‘reddit’ means 'gives back’ in Latin.

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xVjdb TIL that in 2012, Facebook altered the number of positive and negative posts in the news feeds of 689,003 randomly selected users to see if they could make the users more happy or sad. They published the results of this experiment in an academic paper.
0GW1 TIL that rabbits have 44 chromosomes, but hares have 48, making them very, very different animals
ep5Kk TIL that in 2001, a Boy Scout got lost near Yellowstone and ended up spending the night in a cave. In the morning, he woke to the sound of a helicopter and managed to get the pilot's attention. Upon boarding the helicopter, he was shocked to see the pilot was none other than actor Harrison Ford.
8l9K TIL Sony made a special black Playstation that would let you develop games and could only be purchased by mail order. It cost $750 in 1997 and today is very difficult to come by.
MdR8 TIL that Theodore Roosevelt, under threat of a bully at a bar and with a gun pointed at him, is told to make the man a drink, to this he stands up and says ‘Well, if I’ve got to, I’ve got to,’ and throws a right hook, knocking the man down. The bully later left town on a train.