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Over 3000 years ago, the Steppes of Mongolia were dominated by herds of horses, sheep, cows and yaks, and the humans that ate them, according to a new study published this week in the Proceedings of the National Academy of Sciences (PNAS), “milked their animals as well.” However, it is known that the same people were lactose intolerant, causing a temporary historical paradox. Could this study help explain the origins of lactose intolerance in humans?

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