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In the vacuum of space, spacecrafts have to achieve propulsion and steering through more reactive means.

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M7Qem TIL I learned how Champollion cracked the ancient Egyptian hieroglyphic writing. The reason why he succeeded -23 years after the Rosetta Stone discovery- is that he spoke Coptic, and it meant that the sounds written in hieroglyphs made sense to him.
96bB TIL of an Appalachian family that inbred to the point that newborns had blue skin.
BR1W TIL that in 1921, a man in Detroit went so far as to actually kill himself, apparently in order to then communicate with a chosen spiritualist medium, thus proving that the afterlife was real. It didn’t work.
X006k TIL, That despite the homicide rate rapidly rising St. Lucia has yet to have a single murder trial in over 2 years
j6KyQ TIL that Queen's "Another One Bites the Dust" was not intended to be released as a single. They were later convinced to do so by Michael Jackson who had attended a Queen concert in Los Angeles and suggested it to Freddie Mercury backstage.