SocietyMy brother, the terroristTo play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoSocietyInterview: Samantha Early04/01/2016April 1, 2016Charlie Hebdo, the November attacks on Paris, the Brussels bombings, and the Boston marathon attack are among the latest acts of terror to involve pairs of brothers. Psychologist John Horgan researches terrorist behavior.https://p.dw.com/p/1INuyAdvertisement