His doctrine of the world-system, an influential theory in the field, went beyond tribes, nations and ethnic groups.
By comparing fossils and CT scans, researchers say they have reconstructed the skull of the last common forebear of modern humans.
Horse-drawn carts are a staple means of transportation in Dakar, the booming capital of Senegal. But this traditional means of getting around is under increasing threat from motorized rickshaws.
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