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The U.N. Security Council unanimously approved a resolution endorsing a peace process for Syria including a cease-fire and talks between the Damascus government and the opposition. Bebeto Matthews/AP hide caption

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Bebeto Matthews/AP

This undated file image posted on a militant website on Jan. 14, 2014, shows fighters from the Islamic State of Iraq and the Levant (ISIL) marching in Raqqa, Syria. Uncredited/AP hide caption

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The Psychology Of Radicalization: How Terrorist Groups Attract Young Followers

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