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TIL pilots have to wait 6 hours after taking Viagra to fly because it can affect blue/green colour differentiation, interfering with their ability to interpret cockpit instruments and runway lights.

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xBlo TIL a man was executed for starting the Great Fire of London after he claimed he threw a fire-bomb through a bakery window. This was despite the fact that he was heavily crippled, the bakery had no windows, and it was proven at his trial that he was not even in the country at the time.
wL0GW TIL on June 3, 1980, seven tornadoes touched down in or near Grand Island, Nebraska
QN9NM TIL About concrete canvas buildings.
18OW TIL that in the U.S., if you find a bald eagle feather on the ground, you need a permit to pick it up.
a8wa0 TIL that ephedrine, one of the main ingredients in methamphetamine, is made from ephedra, a plant which has been used in traditional medicine for over 2,000 years.