I just read in a magazine that you can judge a person's personality by the position of their jaw. Is that true?

These studies are actually about the perception people have about someone's personality based on chin or jaw position. Studies have found that a person with a "strong" or forward positioned jaw is perceived as being firm and aggressive in behavior. A person with a "weak" or protrusive jaw is perceived as being emotional and kind. It is speculated that judging a person by his or her jaw position is more of an instinctual behavior than a learned behavior.