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TIL Joseph Lister, the father of antiseptic medicine, had the idea that surgeons could prevent infecting their patients by washing and disinfecting their hands with carbolic acid before surgery. This idea earned him ridicule—until people started noticing that it did indeed help.

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mxEvy TIL about Gangkhar Puensum, which is probably the highest mountain no one has ever climbed, since it's located in a country that bans climbing mountains.
0keL TIL Cats are the only species that domesticated themselves.
eaX4 TIL A&T offered a 900 number ($2 first minute, $0.45 for each additional minute) where callers could hear the live ground loop during shuttle missions. This was also used for up-to-the-minute details of Voyager’s encounter with Neptune.
8aB0L TIL July 17, 1972 saw the first two women special agents enter service at the FBI. They were Susan Roley Malone, a former US Marine, and Joanne Pierce, a former nun.
vnZK TIL of Space Adaptation Syndrome, involving nausea and vomiting, vertigo, headaches, lethargy, and overall malaise. 45-75% of all astronauts experience it. It has always resolved within 72 hours.