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TIL that the phenomenon of "Rickrolling" became so popular that that on 1 April 2008, YouTube pranked its users by making every single featured video on its front page a rickroll.

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awZWN TIL that during a 26-year affair with Katherine Hepburn, Spencer Tracy did not divorce his wife. Publicists kept the affair secret outside of Hollywood. Even after he died in Hepburn's presence, they said Tracy had been alone. Out of respect for his family, Hepburn did not attend his funeral.
69QmZ TIL that in the early 20th century, doctors used to prescribe cigarettes to patients as a treatment for a variety of ailments, including asthma, anxiety, and even sore throats. It wasn't until the 1960s that the link between smoking and lung cancer became widely known.
4XlPX TIL that 15 years ago, Berkeley Researchers recovered "typed text using audio recording of keystrokes"
E1Oow TIL about Anthony Ervin, a swimmer who won a gold medal at the 2000 Olympics, retired at 22, begun abusing drugs, at one moment being hardly able to raise from a sofa for days on end. In 2011 he got back into swimming, and at the 2016 Olympics became the oldest swimmer to win a gold medal.
QW7L TIL a mother cow in a US dairy farm made a “Sophie’s Choice” - she hid 1 of her newly born twins and let the farmer took away the 2nd one in the hope of saving at least one of her babies. Both babies were slaughtered.