BOB GIBBONS / SCIENCE PHOTO LIBRARY BOB GIBBONS / SCIENCE PHOTO LIBRARY
Petroglyphs. San (bushman) paintings on a rock in the Cederberg Mountains, South Africa. The San are indigenous people of southern Africa that span areas of South Africa, Zimbabwe, Lesotho, Mozambique, Swaziland, Botswana, Namibia, and Angola. They were traditionally hunter-gatherers but began to switch to farming in the 1950s. Genetic evidence suggests they are one of the oldest, if not the oldest, peoples in the world, from which all humans can ultimately trace their genetic heritage.
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