Although modern physics surrounds us, and newspapers constantly refer to its concepts, most nonscientists find the subject extremely intimidating. Complicated mathematics or gross oversimplifications written by laypersons obscure most attempts to explain physics to general readers. Now, at long last, we have a comprehensive--and comprehensible--account of particles, fields, and cosmology, written by a working physicist who does not burden the reader with the weight of ponderous scientific notation. Exploring how physicists think about problems, Robert K. Adair considersthe assumptions they make in order to simplify impossibly complex relationships between objects, how they determine on what scale to treat the problem, how they make measurements, and the interplay between theory and experiment...