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http://www.scienceofwonder.org/barley-helped-early-farmers-settle-the-dizzying-heights-of-the-tibetan-plateau/

Researchers working at the “roof of the world” reveal that it wasn’t until the successful cultivation of frost-hardy cereal grains on the Tibetan Plateau that humans were able to live year-round at dizzying heights of 3,000 meters. The findings, published in Science this week, helps explain when and how humans adapted to living (and farming) in the harsh high-altitudes. 

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