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Two San bushmen are shown prior to a study in Tsumkwe, Namibia, in this undated handout provided by Cell Press October 15, 2015. Research unveiled on Thursday showed that people in isolated, primitive African and South American cultures get no more slumber than the rest of us. Scientists tracked 94 adults from the Tsimane people of Bolivia, Hadza people of Tanzania and San people of Namibia for a combined total of 1,165 days in the first study on the sleep patterns of people in primitive foraging and hunting cultures. (Photo by Josh Davimes/Reuters)
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