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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Feces contain digested food residue and a wide variety of microorganisms, mostly bacteria, that are adapted to life in the intestines. The gases the microbes produce could help doctors and scientists track and understand changes related to health. Scimat Scimat/Photo Researchers/Getty Images hide caption

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Kids, Allergies And A Possible Downside To Squeaky Clean Dishes
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The Pseudomonas stutzeri bacterium, commonly found in soil, was the most prevalent subway microbe. Lower Manhattan was its prime hangout. Mason/Cell Systems 2015 hide caption

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Biologist Rob Knight, co-founder of the American Gut Project, recently moved the project to the University of California, San Diego's School of Medicine. Casey A. Cass/University of Colorado hide caption

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Lactobacillus acidophilus, which is one variety of the genus Lactobacillus is one of the common active cultures found in yogurt and in the human gut. Scimat Scimat/Getty Images/Photo Researchers hide caption

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Rob Knight, co-founder of the American Gut Project at the University of Colorado in Boulder, works in the lab where the samples are processed. The American Gut Project hide caption

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After a quick swipe and online registration, these test tubes were ready to ship back to the lab at the University of Colorado in Boulder for sequencing and analysis. Katherine Harmon Courage for NPR hide caption

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A turkey vulture makes quick work of a dead rabbit at Martin Luther King Jr. Regional Shoreline park in Oakland, Calif. Sebastian Kennerknecht/Minden/Corbis hide caption

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How Can Vultures Eat Rotten Roadkill And Survive?
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