Vengeance is sweet and expensive

(Max Planck Institute for Human Cognitive and Brain Sciences) Living together in communities requires mutual cooperation. To achieve this, we punish others when they are uncooperative. Scientists at Max Planck Institute for Human Cognitive and Brain Sciences and the MPI for Evolutionary Anthropology in Leipzig discovered now that even six-year-old children feel the need to reprimand antisocial behavior, and that they are willing to take risks and make an effort to be present when the guilty one