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The Not-So-Holy Causes of "Holy Wars" January 23, 2014
Religious violence around the world reached a six-year high in 2012, from attacks on monks in Sri Lanka to bombings of Coptic churches in Egypt. That's according to a new Pew Research study, which found "high religious hostilities" in one third of the countries polled. But are those conflicts really caused by religious differences? Probably not. This week, we're zooming into one spiritual rivalry that's more complex than it seems: the clash between Sunni and Shia Muslims.

Gregory Gause, professor of international relations and Middle Eastern politics at the University of Vermont
Lesley Hazleton, author of The First Muslim: The Story of Muhammad