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15:05
YouTube
biointeractive
The Evolution of Lactose Tolerance — HHMI BioInteractive Video
All adult mammals but humans are lactose intolerant. Follow human geneticist Spencer Wells, director of the Genographic Project of the National Geographic Society, as he tracks down the genetic and societal changes associated with the ability to digest lactose as adults—or lactose tolerance. Explore how evolutionary biology and cultural ...
833.4K views
Aug 26, 2014
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