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The traditional Hadza of Tanzania, East Africa, are one of the last truly hunter-gatherer tribes in the world. They have no money, no possessions, and no control over their food supply, and the result is a non-hierarchical society. Daudi Peterson is the author of a book on the Hadza, 'By the Light of A Million Fires'. (Picture: Members of the Hadza tribe. Credit: Jeff Leach)