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TIL a software developer once tested asking for donations vs. limiting trial version features. He randomly gave people either a version that asks for a donation, or one that is feature-limited. The feature-limited version made five times as much money, and the experiment cost him $17,000 in sales.

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xMk5 TIL, Jimmy Doyle, a boxer who died shortly after a fight with Sugar Ray Robinson, took the fight to buy his mum a house. Robinson, kindly gave all the money from his next 4 fights to Doyle’s Mum, to buy that house. She spent the money on drugs and legal terms to try and sue Robinson for more money.
J1Kpl TIL the reason Listerine works as a mouthwash was not known to science until its 106th year on the market
4kNob TIL about government-caused deaths of over 10000 people during the prohibition era because the govt decided to taint industrial alcohol to dissuade bootleggers from using this cheaper and accessible option to produce illicit liquor - with intent to scare general public away from consuming alcohol
v1byr TIL of the sitcom pilot, "Where's Rodney" which aired once as a burn off during the summer on NBC in 1990, and was about a kid who can magically summon Rodney Dangerfield to give him advice.
PYAlO TIL In 2003, a farmer carrying a syringe loaded with cow antibiotics was knocked down by one of his cows and was accidentally injected. He was transported to the hospital where they called Poison Control, who told him there were no known antidotes. He died less than an hour later.