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dirt is good and kids need exposure to germs

an excerpt from the book 'dirt is good'      web

webhttp://www.npr.org/books/titles/537075702/dirt-is-good-the-advantage-of-germs-for-your-childs-developing-immune-system#excerpt
authorSandra Blakeslee, Jack Gilbert, Ph.D. and Rob Knight, Ph.D
publicationNPR

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