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In a new book, Paul Ehrlich lays out the claim that modern life has been harmful to smaller jaws, which he says leads to problems ranging from heart disease to sleep apnea.

In a new book, Paul Ehrlich lays out the claim that modern life has been harmful to smaller jaws, which he says leads to problems ranging from heart disease to sleep apnea.

When we think of what makes us human, it's common to think of something like language or tool-making. Something that likely doesn't pop into mind is the chin - …

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