... this classi-cal vision in order to understand such large-scale phenomena as black holes, gravitationalwaves, and the final destiny of stars, pulsars,quasars, x-ray sources, and the universe ... techniques are an essential part of a physics education.Over the past two decades, the American Physical Society, the Ameri-can Institute of Physics, and the American Association of Physics Teachers,among ... basiclaws that simultaneously describe quarks and quasars, transistors andtribology, baseball and black holes?Our ability to understand such diverse phenomena relies on the sameprinciple affecting...