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Dirt Is Good
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Dirt Is Good

Dirt Is Good

Dirt Is Good
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  • <iframe src="https://www.npr.org/player/embed/1150240/150240" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

John Ydstie talks with Dr. Scott T. Weiss of Harvard Medical School and Brigham & Women's Hospital in Boston about a study in the New England Journal of Medicine that indicates children's exposure to dirt, dust and bacteria actually helps their immune systems develop more effectively. The idea is called the "hygiene hypothesis."

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