Arthur H. "Bud" Kelder (left) died in World War II. Courtesy of the Kelder family hide caption

itoggle caption Courtesy of the Kelder family

Saudi King Abdullah bin Abdulaziz al-Saud is seen in September 2011. Ahmed Abdelrahman/AFP/Getty Images hide caption

itoggle caption Ahmed Abdelrahman/AFP/Getty Images

Each day, a nurse comes to this clearing outside Taylortown, Liberia, to sing a song of mourning, preparing the space for the next burial. So far nearly 100 people are interred here. Kelly McEvers/NPR hide caption

itoggle caption Kelly McEvers/NPR

Supporters of the Congress for Democratic Change party take part in a meeting in Monorovia on Nov. 20 for the opening of political campaign activities for senatorial elections. Elections are due to take place on Dec. 16, after being suspended because of the Ebola epidemic. Zoom Dosso/AFP/Getty Images hide caption

itoggle caption Zoom Dosso/AFP/Getty Images

A helicopter's eye view of a new ETU, funded by USAID and built by Save the Children. Kelly McEvers/NPR hide caption

itoggle caption Kelly McEvers/NPR

A hand-drawn map on the wall of a rural clinic shows health workers where a woman with Ebola may be hiding. Kelly McEvers/NPR hide caption

itoggle caption Kelly McEvers/NPR

Wencke Petersen, a Doctors Without Borders health worker, talks to a man through a chain link gate in September, when she was doing patient assessment at the front gate of an Ebola treatment unit. "There were days we couldn't take any patients at all," she tells NPR. Michel du Cille/The Washington Post hide caption

itoggle caption Michel du Cille/The Washington Post

Caltech biochemical engineer Frances Arnold was awarded a National Medal of Technology and Innovation by President Obama in 2013. Jason Reed/Reuters/Landov hide caption

itoggle caption Jason Reed/Reuters/Landov