Lea Hatouni is a Christian living in the predominantly Muslim Middle East. Like so many other Lebanese, she expects to have to leave Lebanon to start her career after college. Jason Beaubien/NPR hide caption

She's a teenager with a cellphone, surfing the Internet. And she's a Syrian refugee who works in the fields up to 14 hours a day. That's the new life of 15-year-old Fatmeh, seen here in the living room area of her family's makeshift shelter. Dalia Khamissy for NPR hide caption

Ignaz Semmelweis washing his hands in chlorinated lime water before operating. Bettmann/Corbis hide caption

Emergency room doctor Joshua Mugele (left) stands with Dr. Samuel Brisbane at Liberia's JFK Hospital, which saw its first Ebola patient in June. Courtesy of Joshua Mugele hide caption

A prosthetic eye is a work of art custom-crafted for an individual. Rebecca Davis/NPR hide caption

Gorillas rest in the Virunga mountains of Rwanda. More than half of the world's mountain gorillas live in the volcanic chain in East Africa. Rebecca Davis/NPR hide caption

Beneath 8,200 feet of water, the Alvin submarine scopes out the Pacific's seafloor in the 1970s. The geologists aboard weren't searching for life — they were on the hunt for hot spots and undersea thermal vents. Courtesy of Kathy Crane hide caption