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TIL in 1977 a UK TV news bulletin was interrupted by a voice claiming to be the 'Ashtar Galactic Command' and instructed humanity to abandon its weapons, so it could participate in a 'future awakening' and 'achieve a higher state of evolution'. After six minutes, the broadcast returned to normal.

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YpoOG TIL at 2002 Winter Olympics in Salt Lake, Canadian ice makers secretly hid a loonie (dollar coin) at center ice of the hockey rink. After both Canadian men and women hockey teams won gold, the "lucky loonie" was put in the Hockey Hall of Fame. Canadians still hide coins at the Olympics for luck.
kO7ZB TIL The phrase "How many angels can stand on the point of a pin?" is a 17th century parody of 13th century question, "Can several angels be in the same place?". The joke is a pun on needle’s point = needless point and debating topics of no practical value while there are more urgent concerns.
m1XGp TIL Industrial Biotest Labs (IBT) conducted almost 1/3rd of all safety testing for chemicals and drugs in the US from the 1950s to 70s. It was later was discovered that IBT had been falsifying data amd mislead federal authorities on the safety of many commercial products for approval.
xVR0b TIL Gladiatrix are the female equivalent of the gladiator of ancient Rome and they were almost certainly considered an exotic rarity by their audiences.
NXjvJ TIL that Graf Zeppelin, the first zeppelin to cross the Atlantic, devoted about 30% of its total gas volume to non-lifting synthetic gas. It was used as fuel in combination with diesel to power the dirigible.