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4k6Ga TIL Horseshoe Crabs are more closely related to scorpions and spiders than they are to true crabs
YpRoW TIL that the magnetc field of Earth orients iron-rich minerals in molten lava along the field lines, then becomes locked into place as the lava hardens. By studying different layers of solidified lava, we know that magnetic poles fliped in the past and will do it again.
Vr6B TIL in the last 5 millennia, genetic change in humans has occurred at a rate roughly 100 times higher than any other period of human evolution. Humans today are more genetically different from humans living 5,000 years ago than these people were from humans living 40,000 years ago.