Researchers from the University of Pennsylvania showed students photos of similar-looking, similar-aged men—some with hair and others with shaved heads. They also showed photos of men with hair and then the same man with his hair digitally removed. In both cases, the bald guys were perceived to be more manly and more dominant. Furthermore, the study's participants guessed that the head shavers were an inch taller and 13 percent stronger than their haired counterparts.