A study has found that men with wider, shorter faces were more likely to express racial prejudice

This facial shape has been shown to indicate higher than average testosterone levels and linked to more aggressive behavior. However, researchers from the University of Delaware believe in this case that those with wide faces are less likely to bow to social pressure. The scientists stressed that the results didn't show that the men were necessarily more prejudiced - rather that they were more likely to express these beliefs if they had them.