Teheran, Iran

Iran’s army air force cadets perform Friday prayers on the Muslims’ holy fasting month of Ramadan, at the Tehran University campus, in Tehran, Iran, Friday, Aug. 13, 2010. Over a billion Muslims around the world have begun observing the holy month of Ramadan _ a period devoted to prayer and dawn-to-dusk fasting. This year’s fasting in the Middle East is particularly tough as Muslims struggle through the long hot days of a sweltering summer.

(AP Photo/Vahid Salemi)