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TIL that during the 1521 siege of the Aztec capital of Tenochtitlan, Hernan Cortes' conquistadors attempted to build a trebuchet. The very first shot went straight up and the machine was destroyed.

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xV5G5 TIL there is a word for the blob of toothpaste on your toothbrush, and that word is nurdle.
BrRPr TIL AC/DC frontman Brian Johnson went to record a a jingle for the Hoover Vaccum Company. Having completed the greatest vaccum jingle of all time, he then walked across the street to Vanilla records and auditioned for AC/DC.
XePP TIL that the study that stated that the MMR vaccine can cause autism was scientifically discredited.
N7d81 TIL about “pee paint,” a special paint that repels pee back on the pee-er. Cities use it in an attempt to reduce public urination on walls.
j6wWE TIL a Fir Tree once grew inside a man’s lung.