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TIL since 2009, the names of planets from the Dune novels have been adopted for the real-world nomenclature of plains and other features on Saturn's moon Titan, like Arrakis Planitia.

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g4Ay TIL that ancient Greeks invented the modern shower using piped water. Rich and poor used large locker-room showers with bars to hang up clothing. Ancient Romans did the same, bringing showers to as far as England. The systems and habits of bathing every day disappeared after the fall of Rome.
4516 TIL: There was a “Deaf Zone” created at Grateful Dead concerts where deaf patrons held onto inflated balloons to feel the vibration of the music.
D6Nr TIL that a “knight in shining armor” could be used as a slight since if the amor was shining he was not tested in combat.
L5O0 TiL in 2001 in India, red rain fell containing micro organisms which could not be concretely identified as coming from earth.
v1NJ7 TIL in 1959 a white man from Texas disguised himself as a black man and traveled for six weeks on greyhound buses. After publishing his experiences with racism he was forced to move to Mexico for several years due to death threats.