"For a long time, all the work on how people adapt to high altitude involved Europeans going to high altitude," said Cynthia Beall , a professor of anthropology at Case Western Reserve University . "In the 70s, anthropologists started asking 'does everyone in the world adapt in the same way?' Early work showed, no, they don’t." Beall found that, while natives of the Andes mountains have elevated levels of hemoglobin - the oxygen-carrying molecule - natives of the Tibetan Himalayas don’t. They