Katherine Streeter for NPR

Deco Carter, who drives mostly for Lyft, a ride-hailing service, has been involved in two auto accidents that left him unable to work while his car was being repaired. Alan Toth/KQED hide caption

itoggle caption Alan Toth/KQED

Leahya Ellis and other spinning class participants use exercise as a way to shake away stress, anger and depression. Bastiaan Slabbers for NPR hide caption

itoggle caption Bastiaan Slabbers for NPR

Tatenda Yemeke spent the summer working on mental health issues in Cape Town: "I lived with a Muslim family and they helped me learn about local culture." Courtesy of Tatenda Yemeke hide caption

itoggle caption Courtesy of Tatenda Yemeke

Pauline Cafferkey is now in isolation at the Royal Free Hospital in North London, where she was treated in January for Ebola. Justin Tallis/AFP/Getty Images hide caption

itoggle caption Justin Tallis/AFP/Getty Images

When Dr. Boie Jalloh got the call to join the fight against Ebola in Sierra Leone, his friends told him he'd be crazy to sign on. It's a good thing he didn't listen. Aurelie Marrier Dunienville for NPR hide caption

itoggle caption Aurelie Marrier Dunienville for NPR