At age six, children develop a sense of justice

Young children will pay to watch a puppet being beaten, but only six-year-olds pay more to watch punishment inflicted on a puppet that personally offended them, according to scientists trying to figure out when our sense of fairness first develops.In a beautifully macabre study published today in Nature Human Behaviour, 72 children aged four to six individually interacted with puppets in a miniature theater. One of the puppets gave the child a toy, while the other offered the toy and then withhe