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Short answer: Every once in a (very long) while

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0pPj TIL In 2010 In April 2010, radio astronomers working at the Jodrell Bank Observatory spotted an unknown object in the galaxy M82 ,sending radio signals and the emission was never seen before in the universe,and the object was moving 4 times faster than the speed of light.
pnEZ TIL that E.T. is from the Star Wars Universe
Y7BOW TIL that the face of CPR dolls is based off an unknown French girl who likely committed suicide in the 19th century
lon5r TIL about the "Anchoring Bias," the tendency to use initially presented information to make subsequent decisions. It is a widely studied psychological phenomenon, useful in salary negotiation, haggling, and sales.
1aond TIL that during the Irish Famine, some Protestants offered to feed children, but only if they received Protestant teachings. This enraged Catholics, forced to choose between their children and faith. This stigmatized all Protestant charity, and "souper" remained an insult into the 20th century.