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TIL there is an island off the coast of South Carolina with a colony 4000 rhesus monkeys run by a government research institute.

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via reddit.com

rJvM TIL that the first person to hear the Journey song “Only The Young” was a cystic fibrosis patient in Ohio. The band flew out and played it for the young fan. He died the next day, with a Walkman containing the single still in his hands.
xVMXo TIL the McDonald's Happy Meal debuted in the US in 1979 as the "Circus Wagon Happy Meal"
69mEW TIL James A Garfield's medical treatment after his (then) attempted assassination went horribly, because of the lack of sterile techniques and infection control which ultimately led to his death from infections. The assassin later said, "Yes, I shot the President, but his physicians killed him.”
7rdBp TIL Over a period of four centuries, the accumulated error of adding a leap day every four years amounts to about three extra days. Therefore, the Gregorian calendar drops three leap days every 400 years.
xn10 TIL that at his death in 1937, John D. Rockefeller’s fortune accounted for more than 1.5% of the US GDP, equivalent to $250 billion in today’s money