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Which came first: the people or the sweet potatoes?

TAMPA: The bulbous, colorful sweet potato has long been seen as an artifact of mankind's first ocean voyages, ferried from its home in South America all the way to Polynesia centuries ago. But a controversial new study Thursday questions that assumption, using the most extensive genetic analysis yet to suggest that the sweet potato was widespread on Earth long before humans came into the picture. Researchers at the University of Oxford say their findings show that sweet potatoes (Ipomoea batatas) originated in South…