Victoria Ruiz (left), a postdoctoral fellow in immunology, works with Brianna Delgado, a high school student that she mentors, at the Blaser Lab, inside NYU's Langone Medical Center in New York, NY. Ramsay de Give for NPR hide caption

itoggle caption Ramsay de Give for NPR

A health worker speaks with families in a classroom now used as Ebola isolation ward in Monrovia, Liberia. Ebola-stricken West Africa needs more health staff and more medical facilities. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images

Medical workers at the John F. Kennedy Medical Center in Monrovia, Liberia, put on their protective suits before going to the high-risk area of the hospital, where Ebola patients are being treated, Sept. 3. Dominique Faget/AFP/Getty Images hide caption

itoggle caption Dominique Faget/AFP/Getty Images

A contentious piece of clothing: Members of the Iranian women's soccer team celebrate their win over Syria back in 2007. That year, the international soccer league FIFA banned the wearing of hijabs during games. The ban was lifted in July. Mohammad Abu Ghosh/AP hide caption

itoggle caption Mohammad Abu Ghosh/AP

Smoking has declined by about 4 percent annually in Uruguay since the country required graphic warnings on cigarette packages. Matilde Campodonico/AP hide caption

itoggle caption Matilde Campodonico/AP

Tom Murphy, 56, in his home in Gainesville, Va., was diagnosed with ALS four years ago. An experimental drug seems to have slowed the progression of his disease, he says, though most ALS patients aren't as lucky. T.J. Kirkpatrick for NPR hide caption

itoggle caption T.J. Kirkpatrick for NPR

"I want to grow up and become a police. But I need to study in a good school for that. I want to become a police to protect the country." - Fiza, 13 (India) Courtesy of Nike Foundation hide caption

itoggle caption Courtesy of Nike Foundation