Originally posted by PalynkaI forget where, but I saw a program about people living at high altitudes in the Andes. Apparently when the Spanish arrived they could not have children (they would always have miscarriages) due to the altitude, but over time as they mixed with the locals, they adapted. Clearly there has been some evolution there too.
http://www.nytimes.com/2010/07/02/science/02tibet.html