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
Even if science can’t make life longer, perhaps a pill can make a long life better
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By Leila Schneps and Coralie Colmez
Review by Janet Raloff
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