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TIL that if when Sputnik was launched in October 1957, if you turn on your radio to its frequency, you could hear it, and it sounded like this

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6EDr7 TIL that during "Hell Week", a five and a half day stretch during the training/application phase, US Navy SEAL candidates sleep only a total of four total hours during the week, run more than 200 miles and do physical training for more than 20 hours a day.
WLMB TIL a plotline in The Simpsons episode The Crepes of Wrath is in reference to an actual event where Austrian wineries illegally adulterated thier product with an active ingredient found in anti-freeze.
yVAPv TIL that the RMS Carpathia, the ship that picked up the Titanic survivors, was sunk by a German submarine six years later.
awpN0 TIL McDonald's Filet-O-Fish was invented by franchiser Lou Groen because of falling hamburger sales on Fridays (Lent)in his area. Ray Krock made a deal - they would sell his own "Hula Burger" (grilled pineapple) and the Filet-O-Fish one on Friday, the bestseller would be added to the permanent menu.
9wY6M TIL of the 1925 dystopian novel 'Berlin Without Jews'. In the book, a far-right nationalist political party takes power and expels all Jews from Germany, while society at large does nothing to stop them. When Hitler became Chancellor of Germany in 1933, the author committed suicide.