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176

TIL The Flintstones used to advertise cigarettes

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eJGn TIL that during the construction of the Hubble Space Telescope, a chip of paint flecked off a measuring rod and began giving off false readings. The mirror ended up being 4 microns off, resulting in billions of dollars worth of repair efforts.
W0RX TIL that PETA once called for the practice of Indy 500 winners drinking milk to be banned, as it was cruel to calves as well as racist due to African-Americans having an enzyme which made milk difficult to digest
VM5PB TIL 3.6 billion people have watched some part of the live broadcast of the 2016 Olympics. That is almost half of the world's population.
Ooa9e TIL that Rik Mayall was originally cast as Peeves in Harry Potter and the Philosopher’s Stone, but every time he read his lines, the younger cast members couldn’t stop laughing at him. He was later cut from the film.
X0J88 TIL Yang Liwei, China's first man in space, heard a mysterious knocking in space but it did not come from outside nor inside the spaceship. He has even tried - but failed - to recreate the sound so that experts could help him identify it