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TIL of Pyura Chilensis, a sea creature from Chile that resembles a rock. It is born male and becomes hermaphroditic at puberty, and it’s clear blood contains high levels of the rare element vanadium. It tastes like iodine, sea urchin and soap.

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OjWY TIL At the 2002 winter Olympics, an Australian went from last place to winning the gold medal in speed skating after every other skater crashed on the last corner.
gM577 TIL There's only one confirmed case of a hybrid between an Asian Elephant and an African Elephant, Motty. He only lived to see 11 days before perishing.
m74v TIL there are buttons designed to do nothing so people feel like they are in control of things around them. (re-post because the other link broke)
vWRR TIL That George Washington had 124-126 Ounces of Blood Let Before His Death. Modern Physicians think that this was the cause of his death. A normal person has 162-185 oz of blood.
Z81BR TIL polar bears have a black skin with a transparent fur to absorb the sun's heat. They appear white because the air spaces of each hair scatters the light in all directions.