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TIL: Theres an extremely rare condition humans can have called Hematidrosis which causes a person to sweat blood, normally under extreme physical or emotional stress.

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yQkk8 TIL that in addition to the Percent sign (%) for 1/100, There is also a Per-mille symbol (‰) for 1/1,000 and a per-the-thousand symbol called a Bias Point (‱) for 1/10,000
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