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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.
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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
Why do young people join ISIS? Is it nihilism? Or, as social scientists suggest, a perverse idealism? Hidden Brain explores the psychology of terrorist groups, and why people join them.