In Kairouan, Tunisia, Muslims visit the Great Mosque, one of the oldest and best-known mosques in North Africa. Tunisia has made more political progress than other Arab Spring countries, but it has suffered two major terror attacks in recent months. Anadolu Agency/Getty Images hide caption

itoggle caption Anadolu Agency/Getty Images

Tunisian President Beji Caid Essebsi speaks during a forum on strategic planning, in Tunis, in June. Essebsi has declared a state of emergency his office says is aimed at dealing with the threat of Islamist extremists. Mohamed Messara/EPA/Landov hide caption

itoggle caption Mohamed Messara/EPA/Landov

Health workers wash their hands after taking a blood sample from a child to test for the Ebola virus. On Tuesday, the workers tested people in the village outside Monrovia where a 17-year-old boy died of the disease over the weekend. Abbas Dulleh /AP hide caption

itoggle caption Abbas Dulleh /AP

Police patrol the beach at Sousse, Tunisia, on Sunday. Tunisian authorities have deployed additional security forces, closed some mosques and banned some Islamist groups in the wake of Friday's terrorist attack at a beachfront hotel. Abdeljalil Bounhar/AP hide caption

itoggle caption Abdeljalil Bounhar/AP

Philip Cheruiyot (second from left) leans in to read the song titles on the CD booklet brought by Diane Thram. Cheruiyot's grandfather sang on Hugh Tracey's recording of "Chemirocha II." Ryan Kailath hide caption

itoggle caption Ryan Kailath

The body of a tourist lies near a beachside hotel in Sousse, Tunisia. Dozens of people were killed Friday when at least one gunman opened fire at the hotel, an interior ministry spokesman said. Amine Ben Aziza/Reuters/Landov hide caption

itoggle caption Amine Ben Aziza/Reuters/Landov

At the health clinic in Minjibir, Nigeria, a child is immunized for polio. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR
Screengrab from the film, Present Tense.