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Just being near a positive person is enough to make you smile: Having a friend with a sunny disposition living within a mile of you increases the chances of your being happy by 25 percent, according to a study from the University of California, San Diego. Researchers suspect that happiness is contagious; glass-half-full types tend to be nicer to everyone around them, which makes those people pleasant, and so on. Catch the smiley vibe by regularly joining your most cheerful friends for a run.