This book argues that physics is destined to enter a new era marked by an enlarged conception of physical knowledge. This is not a matter of future discoveries, but has to do with how scientific thought responds over time to what is known today. In the new era a genuinely explanatory dimension is restored to physical science which in the current era of thought is quietly abandoned as archaic. The current view is that for a certain class of phenomena, physical explanations in the sense of descriptions of underlying causal processes are no longer possible. It is assumed that the general demise of classical materialistic causal models (such as the theory of ether as an all-pervading material medium of light propagation) consigns this kind of theorizing to history. This book fully accepts the breakdown of classical causal models, but not the inference that causal explanation itself is outmoded. Instead, it claims that the demise of classical assumptions opens the door on a prospect of...