In Sick Societies, Robert Edgerton argues that the longstanding principle of cultural relativism is misguided. In its place, he claims, we need to evaluate both traditional and modern societies in terms of their commitment to providing a satisfying ?quality of life? for their members. This essay takes up the merits of Edgerton's thesis by using primate data to analyze and consider human nature, the adaptation thesis, the nature of culture, and, on purely hominoid grounds, the ?good? society for humankind.

In Grooming, Gossip and the Evolution of Language, Robin Dunbar argues that speech developed from primate vocalizations as a replacement for grooming. Dunbar convincingly shows that language is just a highly developed form of primate communication. But Dunbar's thesis about the relationship between speech and optimal group size is problematic: his focus on strong ties leads him to overlook the integrative force of weak‐tie networks.