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TIL most vitamin D3 supplements are made from sheep's wool.

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E1AxW TIL the sausage McMuffin is actually made of beef and not pork.
vLGD TIL Crispin Glover, who played Michael J Fox’s father in Back to the Future, is actually younger than him.
XpED TIL: There is a lake in the country of Palau where jellyfish evolved without stingers after the lake’s connection to the sea closed, leaving them isolated from their natural predators. These ‘Golden’ jellyfish are totally harmless to humans and you can swim with them.
Orpg TIL: 76% of all known serial killers in the 20th century were from the United States.
E1ZKd TIL Axolotls can regenerate limbs, organs and even parts of the brain. They are also 1000x more resistant to cancer than mammals. Despite this, they are critically endangered and almost extinct in the wild.