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TIL that mice are terrified by a chemical signal produced by cats, rats, and other predators. These chemicals led the mice to stop or stay close to the ground while they carefully assessed their surroundings.

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Mbrb TIL that in the original Mirage Teenage Mutant Ninja Turtles comics, the Turtles kill Shredder in the very first issue.
MeWNa TIL That in 945, Igor of Kiev, while attempting to collect tributes from the neighboring Drevlians, was murdered by being attached to two bent birch trees, which when released in opposite directions, tore his body in half.
PY4yE TIL That under Saddam's Iraq the Christian Minority was treated no worse equally to the Muslim population and only killed when against Saddam (The Assyrians) In fact Tariq Aziz an Iraqi-Christian even became a close advisor to Saddam.
j6pPj TIL the SCRAM button on nuclear reactors is an acronym for Single Control Rod Axe Man, which initially was just a guy who'd cut a rope to drop in the boron control rods in an emergency
rxNM TIL That elephants cry out of emotion, and in 2013 a baby elephant cried for 5 hours after being rejected by his mother twice.