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TIL Jackie Chan is a classically trained vocalist and has released over twenty albums in over five languages, in addition to providing the theme tunes for several of his earlier films and singing in several Chinese dubs of Disney classics

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7Dox TIL Albert Einstein wrote a 1946 open letter titled ‘The Negro Question’, in which he concluded, “I believe that whoever tries to think things through honestly will soon recognize how unworthy and even fatal is the traditional bias against Negroes.”
e0x1J TIL about Alfred Russel Wallace, a young Welsh explorer who spent 4 years in Brazil, nearly blind after his glasses broke. While returning home the ship caught fire, destroying all his findings. He then went to Malaysia, collecting 127,000 specimens. In 1858 he conceived his own theory of evolution.
YpxBv TIL A dark patch was left intentionally on the ceiling of Grand Central Station's main concourse to show how dirty it was before and after it's first cleaning. The patch was swabbed and tested revealing the dirty ceiling was about 100 years of built up nicotine/cigarette smoke
lgEK TIL that cephalopods (octopus) have been known to remove themselves from their aquarium, move a distance across a lab floor, and enter another aquarium to feed on crabs before returning to their original tank.
Z8Xvp TIL that Isaac Newton studied alchemy, tried to put all the world's religious histories together into one timeline, thought Atlantis was real, associated with secret societies like the Freemasons, and predicted the end of the world in 2060.