During an October visit to Liberia, USAID head Rajiv Shah held a joint press conference with the country's president, Ellen Johnson Sirleaf. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images

Community workers build an Ebola clinic on Nov. 8 in Lokomasama, near Port Loko, Sierra Leone. The community decided to organize and fight the disease — building a holding center for suspected cases, enforcing a travel ban. It created a $100 fine for a handshake and a $200 fine plus six months in jail for an illegal burial. Francisco Leong/AFP/Getty Images hide caption

itoggle caption Francisco Leong/AFP/Getty Images

American USAID chief Rajiv Shah meets with Liberian President Ellen Johnson Sirleaf in Monrovia. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images

A licensed clinician is decontaminated before disrobing at the end of a simulated training session by CDC in Anniston, Ala. Training can take a several weeks, making some employers reluctant to encourage their medical workers to volunteer in the Ebola outbreak. Brynn Anderson/AP hide caption

itoggle caption Brynn Anderson/AP

Astrophysicist Szabolcs Marka has a radical idea: Use light as a barrier between mosquitoes and humans. He was awarded a $100,000 Grand Challenge grant by the Bill and Melinda Gates Foundation to see if the idea really works. Courtesy of the Gates Foundation hide caption

itoggle caption Courtesy of the Gates Foundation

A picture taken with a smart phone shows Syrian refugees queuing at one of the many UNHCR (United Nations Refugee Agency) registration centers in Lebanon. At the same time that civil wars and the Ebola outbreak are plaguing countries in Africa, Syrian and Iraqi refugees are seeking help from agencies. Joseph Eid/AFP/Getty Images hide caption

itoggle caption Joseph Eid/AFP/Getty Images

A book street vendor passes the time on her smart phone as she waits for customers in Havana, Cuba, on Tuesday. The Obama administration secretly financed a social network in Cuba to stir political unrest. Ramon Espinosa/AP hide caption

itoggle caption Ramon Espinosa/AP

Bolivian President Evo Morales sings his national anthem during the annual May Day march in La Paz on Wednesday. He announced during a speech that he was expelling the U.S. Agency for International Development from the country. Juan Karita/AP hide caption

itoggle caption Juan Karita/AP