Laurie Taylor asks why so many Islamist extremists come from an engineering background. He talks to Steffen Hertog, Associate Professor of Comparative Politics at the London School of Economics, about a new study which finds that Islamist and right-wing extremism have more in common than either does with left-wing extremism, in which engineers are absent while social scientists and humanities students are prominent. Is there a mindset susceptible to certain types of extremism? They're joined by Raffaello Pantucci, Director of International Security Studies at the Royal United Services Institute.

Orange prison jumpsuits: Elspeth Van Veeren, Lecturer in Political Science at the University of Bristol, discusses the US prisoner uniform which took on a transnational political life due to the Global War on Terror. Revised repeat.

Producer: Jayne Egerton

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