Oscar Pistorius of South Africa runs in the men's 200-meter event at the Paralympic World Cup in May. Some observers have suggested Pistorius receives an unfair advantage from his carbon-fiber "blade" legs. Michael Steele/Getty Images hide caption

itoggle caption Michael Steele/Getty Images

Mohamed Godb works at Paradise Juices in a Cairo suburb. One way Egyptians are trying to beat the heat this Ramadan season is breaking the fast by drinking fresh juice. Kimberly Adams for NPR hide caption

itoggle caption Kimberly Adams for NPR

Every day at 9 a.m. sharp in Iten, Kenya, 200 or so runners — most of them unknowns hoping to become champions — train on the dirt roads surrounding the town. John Burnett/NPR hide caption

itoggle caption John Burnett/NPR

A mobile clinic set up to test students for HIV is parked near Madwaleni High School in Mtubatuba, KwaZulu-Natal, South Africa on March 8, 2011. Parts of the South African province have HIV rates that are more than twice the national average. Stephane de Sakutin/AFP/Getty Images hide caption

itoggle caption Stephane de Sakutin/AFP/Getty Images

Health care workers in South Africa speak to residents during a door-to-door AIDS awareness campaign, part of a series of prevention efforts that has helped lower the country's HIV infection rate. Mujahid Safodien /Reuters /Landov hide caption

itoggle caption Mujahid Safodien /Reuters /Landov

Anti-AIDS posters hang in the Eshowe public health clinic in South Africa's Kwazulu-Natal province. Clinicians there are hoping to slow the spread of HIV by getting more people treatment. Jason Beaubien /NPR hide caption

itoggle caption Jason Beaubien /NPR

Rudwan Dawod stands in front of a school he helped build in Turalei, South Sudan. The Oregon resident is now detained in Sudan, accused of terrorism after he participated in protests there. Courtesy of Nancy Williams Dawod hide caption

itoggle caption Courtesy of Nancy Williams Dawod

The German tanker Marida Marguerite, which was hijacked off the coast of Oman in 2010. Dietmar Hasenpusch/EPA/Landov hide caption

itoggle caption Dietmar Hasenpusch/EPA/Landov

Kenya has made its public schools free, which has dramatically increased the number of students. But this has also led to overcrowding. Here, four boys share a desk and a single textbook at the Amboni Secondary School in central Kenya. Courtesy of Turk Pipkin hide caption

itoggle caption Courtesy of Turk Pipkin