Appalachia has a distinct culture of sipping soda constantly throughout the day. "Here in West Virginia, you see people carrying around bottles of Mountain Dew all the time — even at a public health conference," says public health researcher Dana Singer. Jin Lee/Bloomberg via Getty Images hide caption
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Scientists examined bacteria in the mouths of twins, and found that it's not as similar as they thought it would be. Sharon Dominick/iStockphoto hide caption