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70

TIL that in pitch darkness, the human eye can detect a single photon

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Q4N6 TIL that Waldo of “Where’s Waldo” fame’s real name is actually Wally and is only called Waldo in the US and Canada.
WkaEB TIL white torture is a type of psychological torture which involves putting the prisoner in a completely white, soundproof room, often leading the prisoner to madness.
W7jJX TIL for several decades shoe shops used to take x-rays of people's feet in order to make their shoes fit better.
5YmlQ TIL Dr. Pepper served hot with lemon was a popular 1960’s holiday beverage
LQW50 TIL that in 60+ years of human spaceflight, only 675 people have been in space(by the USAF definition of flying at least 50 miles or 80 kilometres high)