"There is no direct experimental evidence for string theory. And yet it is one of the biggest games in town. So why do physicists study it and what is it? To answer these questions you need an insider like Conlon, the perfect guide to lead you into the mysterious world of vibrating strings and multidimensional space. Why String Theory? wonderfully unwraps the science, history and philosophy behind one of the most challenging theories of the twenty-first century." —Marcus du Sautoy, Simonyi Professor for the Public Understanding of Science, University of Oxford, UK, and Author of The Music of the Primes

"Joe Conlon has taken on the formidable task of explaining string theory, one of the great theoretical developments of the late 20th century. Building on the successes of fundamental particle physics and general relativity, string theory attempts to dig deeper into reality and to come up with a more consistent and mathematically powerful approach to how the universe works. With remarkable clarity and clear prose, Conlon assembles the edifice of string theory in a way that makes it clear why it is such an important intellectual endeavour. He offers a balanced account of its successes and failures and presents a robust response to the critics of string theory. This is a timely, intelligent, and exciting book that describes the joy and pain of working at the frontiers of theoretical physics."—Pedro Ferreira, Author of The Perfect Theory, and Professor of Astrophysics, University of Oxford, UK

"A very engaging and up-to-date discussion of string theory that describes its main goals and achievements. It includes the history of how it was developed, with its interesting twists and turns. The surprising connections with other areas of physics and mathematics are clearly explained. Highly recommended for a lay reader with an interest in fundamental physics."—Juan Maldacena, Institute for Advanced Study, Princeton, New Jersey, USA