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The flesh color varies from white or yellow to purple or pink in mature yams. Yams have a unique taste, too. Compared to sweet potatoes, yams are less sweet and much more starchy and dry.

Earth's oceans could one day turn purple.Banded iron formations were deposited in the Archean and Paleoproterozoic eons, roughly between 3.8 and 1.8 billion years ago. Life back then was confined ...