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TIL that the discoverer of radio frequency, Heinrich Hertz, did not think his discovery was practically useful in any application.

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Xw46 TIL that when Benjamin Franklin died in 1790, he willed the cities of Boston and Philadelphia $4,400 each, but with the stipulation that the money could not be spent for 200 years. By 1990 Boston’s trust was worth over $5 million.
WkX7Y TIL Florida man Arnold Abbott had been feeding street people at a beach weekly from 1991 till he died age 94 in 2019; he refused to stop even when a FL law limiting public food sharing came out in 2014. FLPD showed up when Abbot was passing out food; an officer demanded: "Drop that plate right now."
DWJg TIL studies show that teens overestimate how much the cooler kids and jocks are drinking and having sex, and also how much the nerds are studying
ADgdw TIL that the source of the mythical Jackalope may have been a virus that causes rabbits produce horn-like growths.
yQxLe TIL of a rare variation of the game of checkers named Canadian Checkers - the board is 12x12 with 144 squares (as opposed to the European standard 10x10/100 square board)