Thought in a Hostile World is an exploration of the evolution of cognition, especially human cognition, by one of today's foremost philosophers of biology and of mind. The central idea of the book is that thought is a response to threat. Competitors and enemies make life hard by their direct physical effects. But they also make life hard by eroding epistemic conditions. They lie. They hide themselves. They seem other than what they are. Sterelny uses this and related ideas to explore from an evolutionary perspective the relationship between folk psychology and an integrated scientific conception of human cognition. In the process, he examines how and why human minds have evolved. The book argues that humans are cognitively, socially, and sexually very unlike the other great apes, and that despite our relatively recent separation from their lineages, human social and cognitive evolution has been driven by unusual evolutionary mechanisms. In developing his own picture of the descent of the human mind, Sterelny further offers a critique of nativist, modular versions of evolutionary psychology. This volume will be of vital interest to scholars and students interested in cognitive science, philosophy of mind, and evolutionary psychology.