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TIL that in 1983, after a mid-air collision, an F-15 pilot continued flying and made a successful emergency landing, only to find out after he landed that he lost the entire right wing in the collision.

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ZdM4 TIL Engineers in Canada receive an Iron Ring to to remind them to have humility. It is in memory of a bridge that collapsed twice due to incorrect calculations involving iron.
EW7P TIL when Nick Drake released his album Pink Moon in 1972 it only sold 2,000 copies. In 2000, 25 years after his death, Volkswagen used the title track for an advertisement and the record sold 5,000 more copies. He was known to have despised commercialism.
4Xmga TIL... The dumbo octopus looks like the Disney elephant and uses it's ear-like flaps to swim.
Jjom TIL in 1985, the writers of Sesame Street decided that the adult characters needed to be shown to believe Big Bird about Snuffleupagus due to concerns that if they did not, children would fear that adults/parents would not believe them about an adult abusing them if they told.
LkNjP TIL that NASA had to change condom (used as part of the urination system in space suits) sizes from small, medium, large to large, gigantic, humongous since all of the astronauts picked up large regardless of their size.