title: Facing the facts.
authors.affiliation: Department of Zoology, Stockholm University, Stockholm, Sweden. olof.leimar@zoologi.su.se
authors.forename: O
authors.initials: O
authors.lastname: Leimar
authors.forename: P
authors.initials: P
authors.lastname: Hammerstein
mesh_terms: D000533:Altruism; D000818:Animals; D001522:Behavior, Animal; D005075:Biological Evolution; D003299:Cooperative Behavior; D005716:Game Theory; D006801:Humans; D008954:Models, Biological; D012641:Selection, Genetic; D035503:Sociobiology