This book combines physics, history, and philosophy in a radical new approach to introducing the philosophy of physics. Accessible to readers with little background in physics or philosophy, this book allows the reader to wrestle with the metaphysical and conceptual problems that drove innovation in physics, from nineteenth–century electromagnetic field theory through relativity and quantum mechanics. Among the topics treated are locality, causality, and scientific explanation; relativity, energy, mass, and the reality of fields; and quantum metaphysics. The books engaging, non–technical style makes it ideal for those who want to go beyond the equations and discover what physics reveals about reality.