Barbara Bush helps a nun to fit on a hearing device during a 2012 event in Gulu, Uganda. She says was interested in architecture as a college student but became a global health activist after visiting East Africa with her parents. Reuters/Landov hide caption
Body collectors come to the home of four children in Monrovia who lost both parents to Ebola. Tommy Trenchard for NPR hide caption
Peter Piot was one of the co-discoverers of the Ebola virus in 1976. "I never thought we would see such a devastating and vast epidemic," he says. Leon Neal/AFP/Getty Images hide caption
A woman walks with children at an orphanage in Addis Ababa, Ethiopia. Policymakers have long called for orphans to be taken out of institutions and placed with foster families, but one study from Duke University is challenging that notion. Sean Gallup/Getty Images hide caption
A Public Health Agency of Canada worker seen inside the National Microbiology Laboratory's Level 4 lab in Winnipeg. Public Health Agency of Canada/Nature hide caption
The orchids that produce vanilla beans have no natural pollinators in Madagascar; the plant must be pollinated by hand — a labor-intensive process with little margin for error. Courtesy of Madécasse hide caption
New Yorkers can take city-run classes to learn how to make their homes and businesses less attractive to these guys. Ludovic Bertron/Flickr hide caption
Dr. Tom Frieden, director of the CDC, talks with staff from Doctors Without Borders during a visit to the nonprofit group's newest Ebola treatment center in Monrovia, Liberia. Tommy Trenchard for NPR hide caption
A team of body collectors carry the corpse of a woman suspected of dying of Ebola in Monrovia, Liberia's capital. Tommy Trenchard for NPR hide caption
A technician tests samples from Ebola-infected patients at a field lab, run by Doctors Without Borders, in Kailahun, Sierra Leone. Tommy Trenchard for NPR hide caption
Hedson Lamour, 28, prays with his color-coordinated band before performing. He entered the contest because his mom was a child slave. Frederic Dupoux for NPR hide caption
Indian schoolchildren eat their free midday meal. Narinder Nanu/AFP/Getty Images hide caption
Rice is just as nice as ice when it comes to bucket challenges. Right: Manju Latha Kalanidhi, creator of the Rice Bucket Challenge, gives grains to a hard-working neighbor. Courtesy of Manju Latha Kalanidhi hide caption
Shops are closed in Monrovia's West Point neighborhood as part of a quarantine to contain the spread of Ebola. Zoom Dosso/AFP/Getty Images hide caption