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TIL the nuclear nightmare scene in Terminator 2: Judgement Day (1991) was considered “the most accurate depiction of a nuclear blast ever created for a fictional motion picture” by members of U.S. federal nuclear testing labs.

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W7wA8 TIL about Parícutin, a volcano in Mexico that suddenly burst out of a farmer’s field in 1943, growing to a height of 200 metres in just 4 months.
rRGLy TIL Until the mid-1960s in Britain, pregnancy tests were done by sending a woman's urine to a lab, where it would be injected into a toad. The toad was checked two hours later and if it had laid eggs, the woman was pregnant.
QJ9aE TIL that a number of Russian PoWs were selected for extermination in The Holocaust because they had "Asiatic Features".
WkONL TIL the African nation of Zambia aspired to beat US and Russia in the Space Race. Their "Afronaut" prep. program included using a tire swing to simulate weightlessness along with downhill barrel rolls for the g-force. They also had plans to Christianize the Martian population, among other things.
Me5oB TIL that moray eels have a second set of jaws inside their throats. These "ballistic" jaws shoot out into the mouth when the eel has caught its prey, bite the victim with their backward-facing teeth, and drag it further into the eel.