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TIL that for much of the 20th century, the US state of Oklahoma practiced blatant sexism when it came to alcohol: women were allowed to drink 3.2% beer at 18 and everything else at 21, whereas men weren't allowed to drink anything at all until 21.

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9Ywvr How is it that we didn't know why the ocean was salty until 1979? National Geographic Explorer-in-Residence Bob Ballard explains why such a basic question remained a mystery for so long—and where his team finally found the answer.
DLaD TIL there was a so called “helpful worm” that would gain access to Windows XP systems, download security patches from Microsoft to close the vulnerability that it used to infect the system, attempt to delete the infamous Blaster worm (if present) from the system, then delete itself.
KO0g4 TIL one of the reasons why the girls that took the Cottingley Fairies photos did not originally state they were fake was because Sir Arthur Conan Doyle believed them to be real, and they did not wish to embarrass him. To the day they died, both girls insisted they had really seen fairies.
5V5jr TIL about Hadara, The Ostrich Boy. He got separated from his parents when he was 2 year-old in the Sahara desert, where he was adopted and raised by Ostriches until he was rescued 10 years later.
ADQZ4 TIL a mother suffers from hyperlactation syndrome, an over production of breastmilk. Instead of dumping her milk she decided to donate them. She spends 4-5 hours each day pumping milk and in two years she has donated 609 gallons of breastmilk, most going to feeding premature babies.