Megnut

The ability to drink [cows'] milk is the most advantageous trait that's evolved in Europeans in the recent past. From the BBC's article: "Although the benefits of milk tolerance are not fully understood, they probably include the advantage of a continuous supply compared with the 'boom and bust' of seasonal crops, its nourishing qualities, and the fact that, unlike stream water, it's uncontaminated with parasites, making it safer."

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