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TIL Most life on Earth used to be purple instead of green

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7rAgr TIL That the reason people drive on the left in Japan dates back to the Edo period. If the sheathes of two Samurai touched they would have to fight, usually to the death. In order to avoid this, Samurai would always walk on the left thus preventing any possibility of bumping sheathes.
kJ0pm TIL that a 2014 study showed that many human subjects preferred to give themselves a mild electric shock rather than being left alone with their own thoughts
p8xgG TIL that Tupac Shakur was a member of the Baltimore branch of the Young Communist League USA in the late 1980s
X0gEP TIL that democracy isn't uniquely a human thing, since many other social animals have been known to implement it
kOnGB TIL Tommy Wiseau has a web show where he is held captive by an alien and forced to play video games