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Mapping milk tolerance

The different circles of color on this map of Europe show where lactose tolerance—the ability for older children and adults to drink milk without it causing illness or discomfort—developed in a particular area. The red area in the center shows where lactose tolerance most likely developed (each dot shows a place where computer simulations produced results very much like real-world conditions). Credit: Yuval Itan, Adam Powell, Mark G. Thomas

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