If you crinkle your eyes when you smile, you'll live past 50 :
When Harker and Keltner inherited the study in the 1990s, they wondered if they could predict from the senior-year smiles alone what these women's married lives would turn out to be like. Astonishingly, Duchenne women, on average, were more likely to be married, to stay married, and to experience more personal well-being over the next thirty years.
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