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TIL that when the Confederate Army was low on gunpowder, bat caves were raided for poop. Bat guano’s high nitrate content provided a key ingredient for the production of gunpowder.

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4kmd5 TIL a chicken once lived for 18 months without a head
R7vY1 TIL that “Teenage Mutant Ninja Turtles” was released as “Teenage Mutant Hero Turtles” in the UK because the word “ninja” was considered too violent.
d8DkQ TIL: The United States government considers toothy smiles “unusual or unnatural expressions” on passports or visas.
Zpm0a TIL that during WW2, Leonard K. Carson led an air combat school within his fighter unit, called "Clobber College".
OblR TIL cat’s kidneys are so efficient it can survive on a diet consisting only of meat, with no additional water, and can even hydrate by drinking seawater.