Physician and Photographer David Heiden.

Fourteen million people in Sudan have been displaced by war and famine. The Atlantic's Anne Applebaum writes about the scale of destruction in her article, "The Most Nihilistic Conflict on Earth."

More than half of the world's Muslims live along the latitude line 700 miles north of the equator — so do most of the world's Christians. It's a place where ideological conflicts often arise. Journalist Eliza Griswold spent seven years examining how the two religions influence clashes over natural resources, tribal issues and faith.

Rapper Emmanuel Jal was one of the "Lost Boys" — youths caught up in violence in Sudan. He later escaped to Kenya. Now he's making music about peace. His new CD is Ceasefire.