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TIL that there’s a 4-mile long river in Peru that’s so hot that it actually boils

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BrkZd TIL There's a natural phenomenon known as “thundersnow”, which happens when thunderstorms form in wintry conditions, giving rise to heavy downpours of snow, thunder and lightning.
kJrvm TIL a United States government contract to create synthetic rubber gave birth to Silly Putty.
p8w4G TIL pieces of Skylab were scattered around a part of Western Australia after its reentry into Earth. As a joke, the local government then fined NASA $400 for littering. It went unpaid for 30 years until a Californian DJ raised funds to pay the fine.
9wwpB TIL the Boeing 747 can carry an extra engine on its wing. Airlines used to use this capability regularly, when engines were less reliable, to deliver replacements to their stranded planes.
9wgPX TIL in 1750, Frederick II, the Great, King of Prussia, sent to his secretary, Claude Étienne Darget, a letter in which he wrote: “My hemorrhoids affectionately greet your cock”