“In 1492 Columbus sailed the ocean blue.” That much everybody knows for sure.
Earlier transatlantic travellers may have beaten him to it, of course: the Vikings almost certainly made the crossing, and there are claims that the Egyptians and all manner of other groups did too. But if most of these pre-Columbian ocean voyages sound outlandish and unlikely, they are nothing compared to a transatlantic journey that appears to have taken place about 40 million years ago.
Midway through the Eocene, a crew of monkeys sailed the ocean, er, green.
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