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TIL the phrase being on "cloud nine" actually comes from a cloud atlas published in 1896 that divides clouds into 10 basic types, the ninth type being cumulonimbus clouds, the most puffy-looking ones. See A Short History of Nearly Everything by Bill Bryson, Part V Chapter 17 Into the Troposphere.

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l7dK TIL That, to prove that stomach ulcers were caused by bacteria and not stress, a scientist drank a beaker of the bacterium. He both developed stomach ulcers and won the Nobel Prize in Medicine.
K4O4 TIL kangaroos give birth to an underdeveloped fetus called a joey. When the joey is born it crawls into its mother’s pouch and attaches to a nipple where it grows and develops to a juvenile stage.
Lk5vP TIL That the London Tower uses ravens to “prevent disaster” and that these birds are technically military members and can be dishonorably discharged!
J1vRk TIL Ships will store and purposefully dump oil into the ocean to create calm seas around them, called storm oil
6wmX TIL “Snozzberry” was coined by Roald Dahl as a slang term for a penis. So in Willy Wonka, the kids are licking wallpaper that tastes like dicks.