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TIL In a similar way to "shoot" and "darn" being inoffensive substitutes for harsh swear words, the Australian exclamation "Crikey," made world famous by Steve Irwin, is shorthand for "Christ kill me"

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w46o TIL chicken was considered a luxury food in the United States until the discovery of vitamin D in 1922, allowing chickens to thrive indoors and during the winter season.
dD9wE TIL that most people can see their own white blood cells moving through their retinas
rYJW TIL In Hong Kong, it is legally permissible for a betrayed wife to kill her unfaithful husband.
RWM8 TIL that the Taipei 101 skyscraper uses a 728 ton steel tuned mass damper (basically a giant pendulum) to counter motion of the building since it is so close to a fault line.
neK7P Today I Learned NASA created a Capture the Flag contest for it's future of manned space travel. On its final flight, Shuttle Atlantis left a small flag on the ISS. This flag was attached to the hatch and was to be brought home by an American spacecraft. It comes home with SpaceX.