A health worker administers polio vaccine as part of a UNICEF-supported campaign in Damascus. Aid agencies sometimes have to negotiate with rebel groups and work in dangerous situations to immunize vulnerable children. Omar Sanadiki/AP hide caption

itoggle caption Omar Sanadiki/AP

A woman drives a car in Saudi Arabia on Sunday. Saudi Arabia is the only country where women are barred from driving, but activists have launched a renewed protest and are urging women to drive on Saturday. Faisal Al Nasser/Reuters/Landov hide caption

itoggle caption Faisal Al Nasser/Reuters/Landov

Secretary of State John Kerry, shown in Jeddah, Saudi Arabia in June, has acknowledged the recent tensions between the U.S. and Saudi Arabia, two countries that are normally close allies. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP

Children play at the Zaatari refugee camp in Jordan, where more than 120,000 Syrian refugees live. Roughly two-thirds are kids, many of whom have been traumatized by the violence in their homeland. Cassandra Nelson/Mercy Corps hide caption

itoggle caption Cassandra Nelson/Mercy Corps

Syrian youths line up for food distribution in the Maiber al-Salam refugee camp in northern Syria, near the border with Turkey. The U.S. government has provided more than $1.5 billion in aid to Syrians since the uprising began in 2011. Dimitar Dilkoff/AFP/Getty Images hide caption

itoggle caption Dimitar Dilkoff/AFP/Getty Images