Ethnic Tibetans took less than 3,000 years to adapt to high altitudes , study says . Professor : Adaptation is fastest genetic change ever observed in humans . Comment: Evolution allows Tibetans to thrive in high-altitude areas , researchers say .
Ethnic Tibetans took less than 3,000 years to adapt to high altitudes , study says . Professor : Adaptation is fastest genetic change ever observed in humans . Study compares genomes of ethnic Tibetan and Han Chinese . Evolution allows Tibetans to thrive in high-altitude areas , researchers say .