A worker disinfects shoes outside the Ebola security zone at a hospital in Mbandaka in the Democratic Republic of the Congo. Junior Kannah/AFP/Getty Images hide caption

Consolata Agunga goes door-to-door as a community health worker, a demanding volunteer job. "It is God who gives me the strength," she says. She is also a small-scale farmer, growing vegetables for her family. Marc Silver/NPR hide caption

Winners of the 2018 Skoll Awards for Social Entrepreneurship (from left) are Jennifer Pahlka, Harish Hande, Jess Ladd, Lesley Marincola, Anushka Ratnayake and Barbara Pierce Bush. David Fisher/Skoll Foundation hide caption

See that little brown critter and that little white critter? They're goats stuck on a bridge in western Pennsylvania. The white goat is facing in the wrong direction to walk off the beam, about 100 feet high, and return to solid ground. Todd Tilson/PA Turnpike Commission hide caption

A Rohingya refugee carries a bag of food in the Hakimpara camp in Bangladesh. Allison Joyce for NPR hide caption

Chemotherapy has made a tremendous difference in survival rates for children with acute lymphoblastic leukemia, the most common type of childhood cancer. FatCamera/Getty Images hide caption

Marjan practices at the Afghanistan National Institute of Music in Kabul. Rachel Corner/De Beeldunie hide caption

Philip Alston, the U.N. Special Rapporteur on Extreme Poverty and Human Rights, is leading a mission to investigate poverty in the U.S. Wang Zhao/AFP/Getty Images hide caption

Kennedy Odede has gone from street boy to social activist. He says: "When you do kindness that you don't expect to come back to you, you are spreading the light in the world." Courtesy of Shining Hope For Communities hide caption

Jenipher Sanni, a former child bride from Malawi, with the bike she used to get to and from school after she left her husband. Courtesy of Jenipher Sanni hide caption