We know a lot about smiling because, believe it or not, there are scientists studying every aspect of how and why we do it. And the more we know about smiling, the more we realize how much we don't know. Scientists still disagree as to whether smiling developed as an expression of emotion ("I'm happy") or as a way of signaling or communicating ("I want to be friendly"). Sometimes we smile when we are happy, but just as often we smile when we really, really, really want to have that chocolate bar and we know that Mom might give in if we smile sweetly. Who knew that such a simple look could be so difficult to figure out?
Reference: http://www.findarticles.com/p/articles/mi_qa4128/is_200311/ai_n9341157
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