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As they pinpoint when and where many crops were first domesticated, researchers are painting a new picture of how-and perhaps whyhumans began to change their relationship to plants

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A growing number of researchers suspect that long-neglected North Africa was the original home of the modern humans who first trekked out of the continent.

A vocal group of geologists and other scientists are pushing to define a new geological epoch, marked by environmental change caused by humans. At the Society for American Archaeology meetings in Honolulu, archaeologists argued that it's high time for their field, which studies humans and their activities over geological time, to have a greater voice in the debate.