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TIL Of the letters of last resort. Each UK nuclear submarine has a safe which contains a letter written by the Prime Minister, with instructions on what to do in the case of nuclear war. They're only to be opened when the UK has been hit by nuclear weapons.

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R5w4w TIL that the first recorded person to fly was Yuan Huangtou, a Chinese former prince who was forced to participate in an experiment in 559 CE with other prisoners in which he was strapped to a kite and flown off a 33 meter tall tower. He was the only survivor and flew 2.5 km.
x6yP5 Today I learned that schizophrenics can tickle themselves.
OVNR TIL Heineken manufactured a bottle shaped like a brick in order to deal with the housing problem in the Caribbean
ndKP TIL that the arcade video game Defender (1981) is so difficult that “Initial attempts lasting less than ten seconds are not uncommon for novices”.
pp9b TIL that your neighbor’s ham radio can interfere with your wifi signal, and that it is the ham radio operator’s responsibility not to mess up your wifi, and if they do, you can report them to the FCC and they can lose their license