Theories of social justice, addressing the world and its problems, must respond to the real and changing dilemmas of the day. A brilliant work of practical philosophy, Frontiers of Justice is dedicated to this proposition. Taking up three urgent problems of social justice--those with physical and mental disabilities, all citizens of the world, and nonhuman animals--neglected by current theories and thus harder to tackle in practical terms and everyday life, Martha Nussbaum seeks a theory of social justice that can guide us to a richer, more responsive approach to social cooperation.