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TIL Universal Studios wanted John Landis to cast Dan Aykroyd and John Belushi in the lead roles in American Werewolf in London. Landis rejected this and went for unknown actors instead.

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R7NP4 TIL There are a billion missing years in earth's rock layers -- one theory is that Snowball Earth, where miles of ice eroded those rock layers and sent the sediment into the oceans where they were plunged back into the mantle to be recycled -- there are also no fossil layers before this period
4XPd5 TIL about the Mirror test, which attempts to determine if an animal possesses the ability of visual self-recognition. The animal gets marked and is then given a mirror. If the animal investigates the mark,it is taken as an indication that the animal perceives the reflected image as itself.
bGDa TIL that, according to the Department of Energy, commuter rail only has about 10% better actual fuel economy than cars, and buses are the worst at more than 20% lower given its sparse ridership.
wy96 TIL Pavel Durov lost his company (Russian Facebook) after refusing to hand over data of Ukrainian protesters to Russia’s security agencies. He also donated a million dollars to the Wikimedia Foundation.
oD0K TIL that vampire bats will die if they can’t find blood for two nights in a row. Luckily, generous well-fed bats will often regurgitate blood to share with others, in exchange for grooming. This has been noted by many naturalists as an example of reciprocal altruism in nature.