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"Most children seem determined to eat dirt. It may be a coincidence, but what those little mud-pie makers appear to intuit is now being supported by a growing body of scientific evidence that early exposure to diverse microorganisms results in healthier immune systems."^^<http://www.w3.org/2001/XMLSchema#string>
<http://missoulanews.bigskypress.com/missoula/flash-in-the-pan/Content?oid=1441893>