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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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GAR9N TIL That early model M-16s were so prone to jams and malfunctions, mostly due to the failure to ship them with cleaning kits and ammunition which fouled the operating mechanism, that the US military produced a comic book detailing proper field stripping instructions for the weapon.
v1nG7 TIL dyscalculia, "math dyslexia" (the difficulty to comprehend arithmetic, understand numbers, and perform calculations) affects up to 60% of people with ADD and dyslexia
6EJQW TIL in 1972 Romas Kalanta was 19 year old Lithuanian high school student known for his public self-immolation protesting against soviet regime in Lithuania. His death provoked biggest post war riots and inspired 13 more similar suicides against regime. His funeral was delayed to prevent publicity.
R7ADl TIL that a comets tail always points away from the sun therefor it doesn’t follow like a tail at all.
Brw9d TIL that high-school kids in the very north of Minnesota have to cross the Canada–United States border to go to school