Spending 30 minutes a week visiting with friends can reduce your chance of developing a viral illness by 67 percent. That's from researchers who found out that fun and laughter kick-start the brain's production of the mood- and immunity-boosting hormones serotonin, dopamine and endorphines. And even when women took nasal drops containing live cold viruses, they stayed healthy - as long as they spent time each week with pals.
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