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TIL that after discovering Jupiter's intense radiation belt , NASA needed a last minute fix to shield the exterior cables of the Voyager deep space probes. They sent a technician to the local supermarket, bought all of the kitchen grade aluminum foil, and wrapped it around the cables.

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XDn8 TIL of Michael Cameron, a student of Greenbrier High School (in 1998) who was suspended for wearing a Pepsi shirt on Coke day.
6Mkm TIL that the Oxford linguistic philosopher J. L. Austin made the claim that although a double negative in English implies a positive meaning, there is no language in which a double positive implies a negative. To which Sidney Morgenbesser responded in a dismissive tone, “Yeah, yeah.”
b6p44 TIL the average Black American has roughly 1/4 European ancestry
nOgP TIL the Canadian flag has only existed since 1965
N7AOe TIL that the current 50-star American flag was designed by a kid in high school.