In this photo from 2009, Syrian President Bashar Assad (left) stands with then-Yemeni President Ali Abdullah Saleh during a welcoming ceremony for Saleh at the presidential palace in Damascus. As the violence continues in Syria, the U.S. and other countries are hoping to convince Assad to step down from power, as Saleh did. Louai Beshara/AFP/Getty Images hide caption

itoggle caption Louai Beshara/AFP/Getty Images

Chinese activist Chen Guangcheng and his wife, Yuan Weijing, arrive at an apartment complex in New York on Saturday. A number of Chinese activists have become far less prominent after leaving their homeland, but Chen hopes to continue his work and remain relevant in China. Mladen Antonov/AFP/Getty Images hide caption

itoggle caption Mladen Antonov/AFP/Getty Images

Chinese activist Chen Guangcheng and his wife Yuan Weijing arrive at the New York University Village apartment complex in New York Saturday. Mladen Antonov/AFP/Getty Images hide caption

itoggle caption Mladen Antonov/AFP/Getty Images

A woman refills her bucket from a well in the south of Mauritania. The Sahel region, south of the Sahara, is facing a third season of drought. Pablo Tosco/AFP/Getty Images hide caption

itoggle caption Pablo Tosco/AFP/Getty Images