Toby Huff examines the long-standing question of why modern science arose only in the West and not in the civilizations of Islam and China, despite the fact that medieval Islam and China were more scientifically advanced. Huff explores the cultural contexts within which science was practiced in Islam, China, and the West. He finds major clues in the history of law and the European cultural revolution of the twelfth and thirteenth centuries, as to why the ethos of science arose in the West and permitted the breakthrough to modern science that did not occur elsewhere.