title: Sociology: The puzzle of human cooperation.
authors.affiliation: Olin Institute for Strategic Studies, Harvard University, Cambridge, Massachusetts 02138, USA. dominic@post.harvard.edu
authors.forename: Dominic D P
authors.initials: DD
authors.lastname: Johnson
authors.forename: Pavel
authors.initials: P
authors.lastname: Stopka
authors.forename: Stephen
authors.initials: S
authors.lastname: Knights
mesh_terms: D000533:Altruism; D005075:Biological Evolution; D003299:Cooperative Behavior; D006801:Humans; D008954:Models, Biological; D011678:Punishment; D012201:Reward; D012306:Risk