Why Sherpas might be the best mountain climbers in the world

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Sherpas, and other populations who live at high altitudes, have evolved special physiological adaptations to help them cope with low oxygen. Andrew Murray at University of Cambridge thinks this is why the Sherpa are amongst the best mountaineers on the planet. Picture: Unidentified mountaineers walk past the Hillary Step, Everest, credit: STR/AFP/Getty Images