Historians of a generation ago were often shocked by the violence with which scientists rejected the history of their own subject as irrelevant; they could not understand how the members of any academic profession could fail to be intrigued by the study of their own cultural heritage. What these historians did not grasp was that scientists will welcome the history of science only when it has been demonstrated that this discipline can add to our understanding of science itself and thus help to produce, in some sense, better scientists.