Smile more. The broader your smile and the deeper the creases around your eyes when you grin, the longer you are likely to live. After looking at the smiles of 230 people in photos taken in the 1950s, scientists at Wayne State University in Michigan concluded that those who had “genuine” full smiles(involving the mouth, eyes and cheeks) lived, on average, seven years longer than people who did not smile.
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Source: Psychological Science, a research journal

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