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Thousands of years ago humans moved for the first time into the Tibetan
plateau, a vast expanse of steppelands that towers some 14,000 feet
above sea level. Although these trailblazers would have had the benefit
of entering a new ecosystem free of competition with other people, the
low oxygen levels at that altitude would have placed severe stresses on
the body, resulting in chronic altitude sickness and high infant
mortality.
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