Christopher Coker, former Professor of International Relations at LSE, is the Director of LSE IDEAS, the London School of Economics foreign policy think-tank. He has published many books, including Rebooting Clausewitz; Men at War; and The Improbable War: China, the United States, and the Logic of Great Power Conflict. His latest book, ‘Why War?’, considers the four questions of the Tinbergen Method for explaining animal behaviour, developed by the Dutch ethologist Niko Tinbergen. This book contends that applying this method to war—which is unique to humans—can help us better understand why conflict is so prevalent throughout our history. Christopher Coker explores these four questions of our past, present, and post-human future, assessing how far scientific advances in gene-editing, robotics and AI systems will alter human agency. From the Ancients to Artificial Intelligence, Why War? is a fascinating and unique investigation of humankind’s propensity to warfare, offering new ways of thinking about our species’ preoccupation with conflict.