How do we define what a person is? Can one suffer radical change and still be a person though not the same person one once was? Is it possible to still be a human being but not a person at all? The word "person" has become a familiar part of many an activist's battle cry in the latter half of the twentieth century: it has been used abundantly by feminists, ethnic groups as well as pro-life and pro-choice advocates. We constantly hear, in medical ethics...