5 Baffling Discoveries That Prove History Books Are Wrong from Cracked. They are:
Cocaine Discovered in Egyptian Mummies, Ancient Hebrew Inscribed on a Rock in New Mexico, Ancient Roman Statues in Mexico, A Norse Coin in Maine, and Ancient Japanese Speakers in New Mexico.
I don't know anything about the rest, but the Maine penny, while certainly Norse (with the caveat that there's some dispute over its context), could easily have been obtained through trade from the well-known Norse outposts at e.g. L'Anse aux Meadows. Not that baffling.
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