Editors' Preface -- List of Contributors -- Aggression in Humans and Other Animals - A Biological Prelude -- Aggression/Violence in Humans and Other Primates - A Historian's Prelude -- What Theoretical Biology has to say on Aggression in Humans and Animals -- Aggression in Humans and Other Primates - Biology, Psychology, Sociology -- Explaining Aggression: The Ultimate-Proximate Problem -- Human Sex Differences in Aggression from the Perspective of Sexual Selection -- The Logic of Aggression - Reciprocal Altruism, Psychological Games and the Persistence of Conflict -- What causes Large-Scale Variation in Homicide Rates? -- One flew over the Cuckoo's Nest: Violence, Uncertainty, and Safety -- Index.