Add Yahoo as a preferred source to see more of our stories on Google. When we’re happy, the corners of our mouths move out and up, our cheeks lift, and the skin around our eyes crinkles. And ...
When we’re happy, the corners of our mouths move out and up, our cheeks lift, and the skin around our eyes crinkles. And researchers now say that process can be reversed: force the muscles of the face ...
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