What does Darwin’s theory have to say about human evolution? To answer this question, we turn first to philosophical discussions on the nature of rationality, specifically those of David Hume and Immanuel Kant. They both argue that the mind is preformed for thinking, with certain norms about mathematics and causality a priori for the individual human. Darwin argues that this is all a product of selection. Those proto-humans who took mathematics and causality seriously survived and reproduced, and those that did not, did not. This is Pragmatism, as we see from a brief consideration of the thinking of C. S. Peirce in the nineteenth century and Richard Rorty in the twentieth. We are not stuck in relativism, because the scientific evidence is that there is little genetic variation between humans. What we do not have, because Darwinism is within the mechanism paradigm, is any way of extracting absolute value from science and hence the natural world. Darwinian science cannot prove human superiority. This is preparing the way for existentialism.