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Both James Eversull (left) and Pat Patchell were treated with experimental chemotherapy and radiation for leukemia as children in the 1960s. Together, they're now some of the country's oldest leukemia survivors.. Courtesy of James Eversull; Courtesy of Pat Patchell hide caption

itoggle caption Courtesy of James Eversull; Courtesy of Pat Patchell

Grey lines connecting health care workers (marked with "+") and patients represent contacts between them. The red figures are carriers of MRSA. Obadia et al./PLOS Computational Biology hide caption

itoggle caption Obadia et al./PLOS Computational Biology

A nurse in 1938 checks the amount of insulin in a needle. For many decades, the only insulin available to people with diabetes came from the pancreases of cattle or pigs. Insulin from animals is still available outside the U.S. — and cheaper than a recombinant DNA version. Bettmann/Corbis hide caption

itoggle caption Bettmann/Corbis

Benjamin Rush, a physician and one of the signers of the Declaration of Independence, invented the rotational chair as a treatment for psychotic patients. He believed the chair helped improve circulation to the mentally ill brain. U.S. National Library of Medicine/Courtesy of Little Brown and Company hide caption

itoggle caption U.S. National Library of Medicine/Courtesy of Little Brown and Company

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

itoggle caption Scimat Scimat/Photo Researchers/Getty Images

Truvada can dramatically reduce the risk of HIV infection when taken as a preventative medicine — if taken every day. Studies are underway to determine if young people are likely to take the pill consistently. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Prion protein can be infectious, spreading from cell to cell in the brain. Here four nerve cells in a mouse illustrate how infectious prion protein moves within cells along neurites — wire-like connections the nerve cells use for communicating with adjacent cells. Science Source hide caption

itoggle caption Science Source

Caregivers who are trained in responding to anxiety or aggression in people with dementia can effectively reduce those symptoms, studies find. iStockphoto hide caption

itoggle caption iStockphoto

Along with sperm, the in vitro procedure adds fresh mitochondria extracted from less mature cells in the same woman's ovaries. The hope is to revitalize older eggs with these extra "batteries." But the FDA still wants proof that the technique works and is safe. Chris Nickels for NPR hide caption

itoggle caption Chris Nickels for NPR