› added 8 years ago

155

TIL That an American flag hung upside down signals that one is in distress and needs help

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N7dEQ TIL a predominant cause of jet lag is the lack of available oxygen in airplane cabins. Airlines only pressurize cabins to levels equivalent to 8000 ft. above sea level to extend the lifespan of the plane.
eRMb TIL that Harry S Truman was the only U.S. president in the 20th century who didn’t earn a college degree.
rReRe TIL about Contranyms. Terms that, depending on context, can have opposite or contradictory meanings.
Go4E TIL 67 years ago today, Chuck Yeager broke the sound barrier. He completed the flight with two broken ribs, and as a result of the injury, had to close the hatch on the Bell X-1 with a broomstick.
VM0EZ TIL out of the 3 volunteers who went in 1986 on a suicide mission to open the valves of the pool at the Chernobyl plant 2 are actually still alive