Many debates about the moral status of things-for example, debates about the natural rights of human fetuses or nonhuman animals-eventually migrate towards a discussion of the capacities of the things in question-for example, their capacities to feel pain, think, or love. Yet the move towards capacities is often controversial: if a human's capacities are the basis of its moral status, how could a human having lesser capacities than you and I have the same "serious" moral status as you and I? This book answers this question by arguing that if something is human, it has a set of typical...

Many debates about the moral status of things-for example, debates about the natural rights of human fetuses or nonhuman animals-eventually migrate towards a discussion of the capacities of the things in question-for example, their capacities to feel pain, think, or love. Yet the move towards capacities is often controversial: if a human's capacities are the basis of its moral status, how could a human having lesser capacities than you and I have the same "serious" moral status as you and I? This book answers this question by arguing that if something is human, it has a set of typical...