When someone looks at your lips while you talk and smiles, it might seem like a subtle gesture, but it actually hides multiple interpretations from a psychological and non-verbal language perspective.

A smile is much more than a cheerful expression, writes author Marianne LaFrance in her new book "Lip Service." The smile, she suggests, "is a social magnet, a trustworthiness meter, a device for ...

Has a stranger told you to smile lately? Or that you'd be "so much prettier" if you slapped a grin on your face? The fact that many men feel entitled to regulate women's smiles is not news — but the ...