lab and says research shows that babies are predisposed to want to interact with good people and avoid bad people. here's an example. >> up goes the curtain. >> 12-month-old lucy watches the puppet show repeatedly and seems to recognize the good behavior and bad behavior right away. after the show, the good green bunny and the bad orange bunny each offer lucy some graham crackers. the good bunny has just one cracker to offer, but the bad bunny has two. which one will lucy choose? >> lucy, whose do you want? oh, that one? >> she takes the one cracker from the good puppet. it's a baby version of a sacrifice. >> most of them choose the one cracker from the nice guy rather than choosing two crackers from the mean guy. so it shows that babies are really willing to take a cost to avoid interacting with the mean guy.