Harvey's public lecture at the Innovation Hub will focus on the causes of extreme pro-group action. New research suggests that willingness to fight and die for a group is motivated by 'identity fusion' - a visceral sense of 'oneness' with the group. Identity fusion has been documented in a wide range of groups including revolutionary insurgents, football hooligans, ritual traditions, and conventional armies. Individuals fused to a group are willing to take great risks to defend it, even to lay down their lives if necessary. This research provides important insights into the causes of suicide terrorism and novel strategies for de-radicalization.