Researchers examined the photographs of 150 Major League baseball players who had appeared in the 1952 Baseball Register and had died by 2009. Those who lived an average of 80 years rather than 73 years were distinguished by their

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The researchers distinguished the players who lived longer by their smiles. This suggests that there is a possible correlation between positive emotions and longevity.

Researchers Examined the Photographs of 150 Major League Baseball Players