The Human Microbiome: Guts And Glory We truly are legion. Trillions of bacteria, viruses, fungi and other microbes dwell in organized communities in and on the nooks and plains of the human body. From birth to death, they shape our health — and not always for the worse.
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The Human Microbiome: Guts And Glory

Trillions of bacteria, virus, fungi and other microbes hiding out in the human body shape health.

Bad bug: The bacterium Clostridium difficile kills 14,000 people in the United States each year. Janice Carr/CDC/dapd hide caption

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Janice Carr/CDC/dapd

Sucking may be one of the most beneficial ways to clean a baby's dirty pacifier, a study found iStockphoto.com hide caption

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Ayodhya Ouditt/NPR