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TIL the Hubble was ridiculed because a mirror was off by less than 1/50th the thickness of a human hair.

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Jeej TIL in ‘92, a ship from China lost 29,000 rubber ducks in the Pacific Ocean. After some washed ashore in Alaska, oceanographers started tracking their progress to learn about ocean currents. Ducks were found in Asia, Australia, the Americas, even Europe. Some were frozen in the Arctic for 15 years.
Qgpp TIL medieval archers wore their quiver with arrow on their belt. Only the ones on horseback wore them on their back.
PY4vG TIL in Finland, local municipalities can veto parliamentary ratification of licensing a new nuclear reactor within their regions.
v1Y4r TIL that the phrase 'from time immemorial' has specific legal meaning in British law, and begins on 6 July 1189, the day Richard I assumed the throne.
E1njw TIL That there was a pigment used in early days of wall paper called Sheele's Green. If it got moldy or damp it would release the arsenic in the air. It is speculated that this is the cause of Napoleons death as green was his favorite color and his walls were lined in green wallpaper.