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Breastfeeding saved infants in Ice Age, led to bigger breast size in humans: Study

Breast feeding might have played a criticial role in infant survival during the last ice age, and it might have led to a common genetic mutation in East Asians and Native Americans, which could have affected the shape of their teeth, says a new study. The genetic mutation, which probably occurred 20,000 years ago, in turn led to more density ...

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