Ants shape each other’s behavior by exchanging chemicals. We do it by standing in front of each other, peering into each other’s eyes, waving our hands and emitting strange sounds from our mouths. Human-to-human communication is a true wonder of the world. We do it unconsciously every day. And it reaches its most intense form on the public stage.1 Yes, belonging to the family Hominidae puts our interpersonal communication on a different plane from that engaged in by members of the