Marc Silver

The markhor, pictured above, is a species of wild goat found in Pakistan as well as places like Afghanistan, Tajikistan and the Himalayas. Zahoor Salmi/Getty Images hide caption

Screenshot from BBC's "Fighting fire with goats" BBC/Screenshot by NPR hide caption

Education activist Angeline Murimirwa was given the "Diamond Ball Honors Award" by Rihanna's Clara Lionel Foundation. Kevin Mazur/Getty Images hide caption

Man Kaur of India celebrates after competing in the 100-meter sprint in the 100+ age category at the World Masters Games in Auckland, New Zealand, in April 2017. Michael Bradley/AFP/Getty Images hide caption

Warrior pose does not intimidate this kid. Marc Silver/NPR hide caption

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

Rohingya children carrying firewood into the Kutupalong camp in Bangladesh. Refugees have stripped almost all the area vegetation to use in cooking fires. Allison Joyce for 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 Aganga 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