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TIL the majority of infections from swimming pools and hot tubs are caused by cryptosporidium, a diarrheal disease caused by microscopic parasites which are released (anally) into the water and then consumed (orally) by fellow swimmers. Hotel pools are the primary place of infection.

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JJnB TIL Raisa Gorbachev once told a British minister there were more than 300 ways to cook potatoes in the USSR. When he had doubts, she sent him a cookbook and a note: “My apologies for being somewhat inaccurate: in fact, there are five hundred, rather than three hundred, recipes to cook potatoes.”
b9A4E TIL at least 165 people survived both the Hiroshima and Nagasaki bombings in Japan during WWII.
8eloP TIL the peace symbol was designed by Gerald Holtom in 1958 and is a super-imposition of the semaphore signals for the letters "N" and "D", taken to stand for "nuclear disarmament".
KOv1E TIL there's no archaeological evidence that the siege of Masada ended with the mass suicide of its defenders.
ABAB TIL We landed a man on the moon before Alabama allowed interracial Marriage.