 The above sorts of questions, which are receiving growing attention in the sciences, all pertain to morality understood as a set of empirical phenomena to be explained: it is an empirical fact about human beings that we make moral judgments, have certain feelings and behave in certain ways, and it is natural for the sciences to seek causal explanations for such phenomena. At the same time, however, it is a very complex matter—and one often neglected outside of philosophy—how such empirical, explanatory projects are related to the very different sets of questions and projects pursued by philosophers when they inquire into the nature and source of morality.