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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

itoggle caption Scimat Scimat/Getty Images/Photo Researchers

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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

itoggle caption The American Gut Project

Sandra Lopez (left) and her dog, Coco, greet hospice nurse Heather Meyerend last fall. In the weeks before Lopez died, Meyerend stopped by weekly to check her physical health, pain levels and medications. Amy Pearl/WNYC hide caption

itoggle caption Amy Pearl/WNYC

The coronavirus responsible for Middle East respiratory syndrome (green particles) seen on camel cells in a scanning electron micrograph. NIAID/Colorado State University hide caption

itoggle caption NIAID/Colorado State University

Valerie Davidson was appointed health commissioner by Alaska's Gov. Bill Walker to help him expand Medicaid in the state. She'll look for middle ground with Republicans to get it done, she says. Lori Townsend/Alaska Public Media hide caption

itoggle caption Lori Townsend/Alaska Public Media

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

itoggle caption Katherine Harmon Courage for NPR

Number of providers by state who wrote at least 3,000 prescriptions for Schedule 2 controlled substances in 2012 in Medicare Part D. ProPublica/NPR hide caption

itoggle caption ProPublica/NPR