"In a series of studies, scientists found that when people swap their concrete confines for a few hours in more natural surroundings — forests, parks and other places with plenty of trees — they experience increased immune function. "
http://www.nytimes.com/2010/07/06/health/06real.html?_r=4
http://www.nytimes.com/2010/07/06/health/06real.html?_r=4
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