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TIL that in the Middle Ages, rhyming nicknames were becoming common and that is the reason why Bill is short for William(Will), and Dick is short for Richard(Rick)

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PAVL TIL that airbags work by using a magnet that holds a metal ball which gets released under specific forces - closing an electric circuit that inflates the pillows.
PbDe TIL that in 2010, an ex-amusement park worker created a roller coaster concept specifically and efficiently designed to kill its passengers with “elegance and euphoria.”
P1NLn TIL a 2019 study documented how the percentage of heterosexual married couples who met online rose from only 2% in 1998 to 20% in 2008 and then to nearly 50% in 2017, which made it the dominant form of initial contact for couples who marry.
Brk0K TIL that Christopher Nolan was so secretive about Interstellar that he initially asked Hans Zimmer to compose the score with just a one-page story about a father who leaves his child to do an important job instead of giving him the script. It contained two lines of dialogue: "I'll come back & when?"
BJJD TIL that men are more likely to have sons if they have more brothers and are more likely to have daughters if they have more sisters.