Rebel Ideas examines the power of 'cognitive diversity' - the ability to think differently about the world around us. It explains how to harness our unique perspectives, pool our collective intelligence and tackle the greatest challenges of our age - from climate change to terrorism. It draws on a dazzling range of case studies, including the catastrophic failings of the CIA before 9/11, a fatal communication breakdown on top of Mount Everest and a moving tale of de-radicalisation in America's Deep South.