An anonymous reader writes "People who are outgoing, optimistic, easygoing, and have a good sense of humor and a large social network are likely to live longer than others who don't possess these personality traits, according to new research (abstract). The study reveals how saying, 'It's in their genes' could refer to more than just genetic variations that give a physiological advantage, like having high levels of HDL ('good') cholesterol, because people with positive personality traits appear to live longer than those who do not."
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