By the end of World War I, Albert Einstein had become the face of the new science of theoretical physics and had made some powerful enemies. One of those enemies, Nobel Prize winner Philipp Lenard, spent a career trying to discredit him. Their story of conflict, pitting Germany’s most widely celebrated Jew against the Nazi scientist who was to become Hitler’s chief advisor on physics, had an impact far exceeding what the scientific community felt at the time. Indeed, their mutual antagonis...