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Molly Rauch, M.P.H., is science editor of The Green Guide, the premier source of information for environmentally conscious consumers. She received her master's degree in public health from Columbia, where she studied mosquito-borne disease.
As summer finally rolls in, most of us are eager to shed our layers and splash in the surf or hike through the woods. Along the way, we might slap on some SPF 30 sunscreen …