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TIL that when people faint at the sight of blood, it's because their body is actually trying to calm them down because they're overly-excited. It overshoots and the person passes out. It's called vasovagal syncope.

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Q6ak TIL More African elephants are being born without tusks. Ivory poaching may be an evolutionary pressure resulting in survival of the tuskless.
AN5l TIL the phrase “raining cats and dogs” originated in seventeenth-century England. During heavy rainstorms, many homeless animals would drown and float down the streets, giving the appearance that it had actually rained cats and dogs.
JvYk TIL that through a US government website you can find out how much pharmaceutical companies are bribing your specific doctor
YpBDv TIL Humpty Dumpty wasn't an egg, but a large piece of artillery mounted on a castle wall, that got damaged in the English Civil War (allegedly).
Pr5n TIL: The UN Security Council in New York displays a copy of one of the first recorded peace treaties, the Egyptian-Hittite Treaty