This book explains how philosophy transformed human knowledge and the world we live in. Philosophical investigation is the root of all human knowledge. Developing new concepts, reinterpreting old truths, and reconceptualizing fundamental questions, philosophy has progressed-and driven human progress-for more than two millennia. This concise history of philosophy's world-shaping impact demonstrates that the modern world-including its science, technology, and politics-simply would not be possible without the accomplishments of philosophy. Philosophy's idea of rational inquiry as the key to theoretical knowledge and practical wisdom has transformed our world. From the laws that govern society to the digital technology that permeates modern life, philosophy has opened up new possibilities and set us on more productive paths. This volume explains and illuminates as never before the inexhaustible richness of philosophy and its influence on our individual and collective lives.