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"The Tibetan example of human evolution beats the previous record holders in northern Europe, who evolved lactose tolerance to digest the milk sugar lactose over the course of about 7,500 years.."
http://www.livescience.com/6663-tibetans-underwent-fastest-evolution-humans.html
Audio from google tech talk "Genetics and Intelligence": http://youtu.be/62jZENi1ed8
