Mystery: South American Sweet Potatoes Arrived In Polynesia Before Humans Did

“This paper shows sweet potatoes were already in Polynesia when the islands were first colonized by humans thousands of years ago,” says Lars Fehren-Schmitz, a paleogeneticist at the University of California, Santa Cruz. “But it can’t prove there was no contact between Polynesians and South Americans before Europeans arrived.” (Click on title for full story.)