HPV vaccine prevents cervical cancer and other cancers by fending off the virus that causes them. But it's been a tough sell with doctors and parents. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

Most of the people who got measles in last year's outbreaks hadn't been vaccinated with the MMR vaccine. Photo illustration by Justin Sullivan/Getty Images hide caption

itoggle caption Photo illustration by Justin Sullivan/Getty Images

Nurses Katherine Malinak and Amy Young lift Louis DeMattio, a stroke patient, out of his hospital bed using a ceiling-mounted lift at the Cleveland Clinic. Dustin Franz for NPR hide caption

itoggle caption Dustin Franz for NPR

Melissa Mathis holds a container of freeze-dried placenta capsules. Carrie Feibel/Houston Public Media hide caption

itoggle caption Carrie Feibel/Houston Public Media

"It would be disingenuous of me not to suggest that the link between the ... recommendations and insurance coverage hasn't put an additional focus on our work," says Dr. Michael LeFevre. Courtesy of Michael LeFevre hide caption

itoggle caption Courtesy of Michael LeFevre
Thomas Dunne Books
Keith Negley for NPR

Sequencing the genes of a cancer cell turns up lots of genetic mutations — but some of them are harmless. The goal is to figure out which mutations are the troublemakers. Kevin Curtis/Science Source hide caption

itoggle caption Kevin Curtis/Science Source

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