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What's in a smile?

Well, a lot it seems.

Smiles are multi-lingual–nearly all cultures in the world recognize the smile as an expression of goodwill and friendship.

Smiles are versatile–there are more than 18 different types of smiles used in social settings.

Smiling is innate, not learned behavior–even babies who are born blind smile.

Smiling releases endorphins, the "feel good" chemicals of the body.