Eugenia South of the Perelman School of Medicine talks about researching how walking by green spaces reduces stress. http://www.newsworks.org/index.php/homepage-feature/item/79827-greening-vacant-lots-in-philly-is-good-for-your-heart-before-and-after-photos?linktype=hp_impact March 23, 2015 Newsworks (WHYY-FM)