Why humans and other primates care about fairness, with Sarah Brosnan, PhD

Questions of fairness, justice and morality might seem unique to humans. But research suggests that non-human animals notice inequality as well. Dr. Sarah Brosnan, of Georgia State University, talks about how non-human primates and other animals react to unfair situations, why we humans care so much about fairness, and how studying non-human animals can help us better understand how our human sense of justice evolved.