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TIL that when a hawk moth caterpillar feels threatened, its body swells up taking the shape of a pit viper's head, with two huge black markings appearing as the snakes' eyes. The caterpillar also turns itself over to reveal its belly, completely transforming itself into a menacing predator.

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9yxG TIL a JFK assassination witness claimed to see an suspicious unidentified man standing in the window of the school book depository, who later fled the scene. His testimony was ignored, he was intimidated several times, and there were several attempts on his life.
dDZl8 TIL that six American soldiers have defected to North Korea after the end of the Korean War.
9Y91G TIL in 1824, a French physicist unknowingly initiated the science of "thermodynamics" outlining the second law and developing the notion of a "reversible process" in nature, when he wrote a book about how to maximize the efficiency of steam engines, at the age of 27
nenmB TIL In 1999, NASA lost a $125 million Mars orbiter because half the project staff used imperial measurements and the other half used metric.
yQ1Dp TIL that before he went on to become a successful solo artist, Michael Bolton unsuccessfully auditioned for Black Sabbath