Alan McElligott, a professor of animal behavior, is eager to learn more about goat-human interactions. Alan McElligott hide caption

Kennedy Odede (in blue shirt) is dancing for a good reason. The charity he and his wife started has been awarded the $2 million Hilton Humanitarian Prize. He's joined by residents of Kibera, the neighborhood in Nairobi where his nonprofit group provides educational, health and clean water services. Anwar Sadat hide caption

Aretha Franklin, onstage at The Metropolitan Opera House on September 18, 2011. Jemal Countess/Getty Images hide caption

A poster for the film Thirteen Lives, now streaming on Prime Video, which re-creates the rescue of a soccer team of 12 boys and their coach who were trapped in a flooded underwater cave in Thailand in 2018. Amazon Studios/ Screenshot by NPR hide caption

Soumana Saley, a leather craftsman from Niger. Pearl Mak/NPR hide caption

In 2016, NPR correspondent Ofeibea Quist-Arcton shared breakfast with Anthony Bourdain at Marché Kermel in Dakar, Senegal. CNN hide caption

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