A man rides past the Huanan Seafood Wholesale Market in Wuhan, China, which was closed after being linked to cases of a newly discovered coronavirus. Getty Images hide caption

From left: Sekou Sheriff, of Barkedu village in Liberia, whose parents died at an Ebola treatment center; a polio vaccination booth in Pakistan; a schoolgirl in Ethiopia examines underwear with a pocket for a menstrual pad; an image from a video on the ethics of selfies; Consolata Agunga goes door-to-door as a community health worker in her village in Kenya. From left: John Poole/NPR; Jason Beaubien/NPR; Courtesy of Be Girl Inc.; SAIH Norway/Screenshot by NPR; Marc Silver/NPR hide caption

Patients line up for remote health consultation sessions on a remote island near Rangpur, Bangladesh. Allison Joyce for NPR hide caption

Gefilte fish ... made from canned tuna. Marc Silver/NPR hide caption

Computer illustration of malignant B-cell lymphocytes seen in Burkitt's lymphoma, the most common childhood cancer in sub-Saharan Africa. Kateryna Kon/Science Photo Library/Getty Images hide caption

Guns collected in an effort to buy back firearms in Anaheim, Calif., in 2016. The police department obtained 676 guns and gave out $100 gift cards in exchange. The U.S. rate of deaths from gun violence, at 4.43 deaths per 100,000 people, it is four times higher than the rates in war-torn Syria and Yemen. Jeff Gritchen/MediaNews Group/Orange County Register via Getty Images hide caption

A fisherman's boat makes its way across Lake Chilwa in Malawi. A large portion of Lake Chilwa dries out every year, and the fishing industry disappears along with it. Most fishermen then head to Lake Malawi, where there is fishing year-round. Julia Gunther hide caption

Kennedy Odede and Jessica Posner Odede during their countdown to parenthood. June July hide caption

This man is wading from house to house in the Wimbi neighborhood of the city of Pemba, one of the hardest hit by flooding. He and others helped residents bring their possessions to higher ground. Tommy Trenchard for NPR hide caption

Trying to make the world a better place: (left to right) Skoll Award winners Gregory Rockson of mPharma, Nicola Galombik and Maryana Iskander of Harambee Youth Employment Accelerator, Nancy Lublin of Crisis Text Line, Bright Simons of mPedigree and Julie Cordua of Thorn. Greg Smolonski/Skoll hide caption

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