Very interesting...
Human evolution at work...
I thought of researching this because my daughter is touring South America and her last e-mail mentioned that when she was on a tour at 14,000 feet she could hardly walk up hill, and yet the local guides had no problems at all.
Prehistoric and contemporary human populations living at altitudes of at least 8,000 feet (2,500 meters) above sea level may provide unique insights into human evolution, reports an interdisciplinary group of scientists.
Three High-Altitude Peoples, Three Adaptations to Thin Air
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