Libya's Gen. Khalifa Hifter speaks at a news conference in Abyar, a small town to the east of Benghazi, on May 31. Hifter, a former military officer in Moammar Gadhafi's army, has has launched a self-declared campaign against Muslim extremists. This has won him both supporters and enemies. Esam Omran Al-Fetori/Reuters/Landov hide caption

itoggle caption Esam Omran Al-Fetori/Reuters/Landov

On the lookout for SARS, an employee checks a baby's temperature at the Ben Gurion Airport in Israel, in 2003. The deadly virus quickly spread around the world once it reached Hong Kong, a central travel hub. Nir Elias/Reuters/Landov hide caption

itoggle caption Nir Elias/Reuters/Landov

Meriam Yahia Ibrahim Ishag, a Christian Sudanese woman sentenced to death, sits in her cell with her baby girl a day after she gave birth at a women's prison in Khartoum's twin city of Omdurman last month. A court ordered Ishag freed Monday. AFP/Getty Images hide caption

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A health worker from Doctors Without Borders examines Ebola patient Finda Marie Kamano, 33, at her home in Conakry, Guinea, in April. The outbreak that began in February is still spreading in West Africa. Sylvain Cherkaoui/Cosmos/Courtesy of Doctors Without Borders hide caption

itoggle caption Sylvain Cherkaoui/Cosmos/Courtesy of Doctors Without Borders