It's not just kombucha and yogurt: Probiotics are now showing up in dozens of packaged foods. But what exactly do these designer foods with friendly flora actually offer — besides a high price tag? Saul Loeb/AFP/Getty Images hide caption

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(Top left to right) Cladosporium werneckii, Aspergillus fumigates and Aspergillus fumigateurs. (Bottom left to right) Sepedonium, Aspergillus niger and Fusarium. Centers for Disease Control and Prevention hide caption

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When a baby is born by cesarean section, she misses out on Mom's microbes in the birth canal. Sarah Small/Getty Images hide caption

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Researchers Test Microbe Wipe To Promote Babies' Health After C-Sections
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The stomach of Oetzi, who was mummified in ice, was home to bacteria that scientists were able to identify. The same species lives in the gut of many modern humans. EURAC/Marion Lafogler hide caption

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Stomach Of Ancient Iceman Held Microbes Like Ours
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Artist Rogan Brown's paper sculptures are many times larger than the organisms that inspire them. Magic Circle Variation 5 is approximately 39 inches wide by 39 inches tall in its entirety. Brown has created multiple versions of Magic Circle, the shape of which alludes to a petri dish and a microscope lens. Courtesy of Rogan Brown hide caption

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Researchers used cotton swabs to sample bacteria and other microbes from the skin of donated corpses placed in a field in Huntsville, Texas. Katie Hayes Luke for NPR hide caption

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Tiny Witnesses: Microbes Can Tell When A Murder Victim Died
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The purple-stained Rothia dentocariosa bacteria are frequently found in the human mouth and respiratory tract. CDC hide caption

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Missing Microbes Provide Clues About Asthma Risk
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Wherever You Go, Your Personal Cloud Of Microbes Follows
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