Human beings have always liked to think of themselves as special. So what, exactly, is it that does make us special? Are we, in fact, special at all or our we just another - albeit less harry - chimpanzee? This is the question Jared Diamond asks in The Third Chimpanzee: the Evolution and Future of the Human Animal. He asks it not with metaphysics or theology but with biology, geography and social science. He questions our unique construction, the places we live and how we interact; both interspecies and intraspecies, and which of these key components that can be measured may - or may not - either separately or in combination be the key that makes us human.