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TIL that between WW1 & WW2 the USA had a war plan in place for invading Canada in fears the British Empire would try to invade the USA through their colonies. War plan red was even updated to authorise the use of chemical weapons against Canadian citizens.

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6Eb6l TIL that Jellyfish are part of the Physium Cnidaria (which also includes Corals) and start their life as Larva that hooks to the ground and can reproduce asexually. The part we know as a Jellyfish "spawns" once it reaches adult size and reproduces normally.
1kdV TIL Will Purvis, who was convicted of murder in 1894 and had always maintained his innocence, told the jury he would “live longer than the lot of them”. He survived a hanging, was re-incarcerated, and eventually pardoned and released. He died in 1938, three days after the last juror had died.
GAKy1 TIL that Stephen King decided on the location for the Shining, by opening an atlas and randomly pointing at a location, which happened to be Boulder, Colorado.
a8jV0 TIL about the Case of Prohibitions, a 1607 court ruling by Chief Justice Edward Coke that overturned a decision of King James I to his face. The King was greatly offended and said it was treason to assert an authority above the king, except god. Coke replied: the King is “under God and law.”
aOk0 TIL that on August 21, 1986, Lake Nyos in Cameroon released a wave of concentrated carbon dioxide that killed around 1,800 people and thousands of animals almost instantaneously. One witness said, “On that day there were no flies on the dead. The flies were dead too.”