Naturalism is the label for the thesis that the tools we should use in answering philosophical problems are the methods and fi ndings of the mature sciences-from physics across to biology and increasingly neuroscience. It enables us to rule out answers to philosophical questions that are incompatible with scientifi c fi ndings. It enables us to rule out epistemological pluralismthat the house of knowledge has many mansions, as well as skepticism about the reach of science. It bids us doubt that there are facts about reality that science cannot grasp. It gives us confi dence to assert that by now in the development of science, absence of evidence is prima facie good grounds for evidence of absence: this goes for God and a great deal else.