This book is a collection of papers on a fundamentally new concept in physics - the photon's magnetic field, beta^ pi. It discusses various applications of beta^ pi to predict the existence of new magneto-optic phenomena and to reinterpret some of the fundamentals of optics in terms of beta^ pi of the photon. One of these new phenomena, optical NMR spectroscopy, has already been verified experimentally, leading to a major new analytical technique of widespread potential utility.