old choose the mean guy. and with babies around parker's age, a little over 1-year-old, 100% of them prefer the mean guy. >> so does this mean that bias is inherent and that bias is built into us? >> i think it does. we're biased to others who share our opinions or are similar to us in key ways. i guess to try to spin, you no he, the positive is if we're built to dislike differences we're built to like similarities. it's remembering that someone is like us in some way an gives us the connection to them. >> we've seen babies express positive feelings liking good behavior and rewarding today behavior and we've seen them express not so positive feelings by discriminating against others. so wa do these studies mean in the long-term? karenwin and her team at yale hope by studying these innate feelings babies, we can all learn where our moral beliefs come from. anderson cooper, cnn, new haven, connecticut. >> this research really makes