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TIL that the DSV Limiting Factor, a submarine that is used to dive into the deepest point of Earth, is owned by Valve's (makers of Steam, a PC gaming storefront) Gabe Newell.

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0dgnj TIL that when J.J. Benjamin traveled in Persia circa 1851, he noted Persian Jews were not permitted to leave their houses when it rained, “for it is said the rain would wash dirt off them, which would sully the feet of the Mussulmans.”
Brj9r TIL the margarita so named because it is based on a popular Mexican drink, the Daisy. "Margarita" is Spanish for "daisy".
x6MD5 TIL during WWII, the U.S. developed bat bombs, attaching napalm to hibernating Mexican free-tailed bats to ignite Japanese cities. Tested in 1942-43, the project caused accidental fires in US military camps but was canceled in 1944 for the atomic bomb
4k4P6 TIL of the Battle of Caribou, in which neither the US nor Canada lost any troops due to combat - but a couple of armed Canadian lumberjacks were injured by bears.
BQGW TIL one of the undisputed fathers of computer science helped develop crypto analytical devices to fight the Nazis. His reward; a criminal conviction for homosexuality and forced chemical castration. Within 1 year he became impotent, developed breasts due to hormonal imbalance, and committed suicide.