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TIL The USAF and later Atomic Energy Commission tried to develop a nuclear propulsion system for aircrafts between 1946 and 1961 at a total cost of about $1 billion. Two of assemblies, consisting of a reactor and two modified turbojets each, is on display at Idaho National Laboratory.

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a8QZ TIL that the Universe may exist inside a black hole.
xYkg TIL that, in 2007, Princes William and Harry asked Channel 4 not to broadcast a documentary featuring footage of their mother’s dying moments. Channel 4 broadcast the documentary anyway, then put out an additional programme an hour later to debate whether it had been right for them to do so.
R8BQ TIL brass doorknobs disinfect themselves in about eight hours.
orjK TIL that conspiring with another person to facilitate the seduction of a woman (be a wingman) is still an indictable offence in Tasmania, Australia.
rR7b4 TIL the maze generation algorithm for the 1982 Atari game Entombed always makes solvable mazes just by looking at the 5 nearest tiles, and nobody understands why it works—it came upon a programmer when he was drunk