How do scientists develop new explanations of disease? And how does medical diagnosis change when physicians are confronted with new scientific evidence? These are some of the questions that Paul Thagard pursues in this pathbreaking book that develops a new, integrative approach to the study of science. Ranging through the history of medicine, from the Hippocratic theory of humors to modern explanations of Mad Cow Disease and chronic fatigue syndrome, Thagard analyzes the development and acceptance of scientific ideas.