Smile, and the whole world smiles with you. But they don't all necessarily mean the same thing. Marianne LaFrance convinces us there's a secret wealth concealed behind that most common of facial expressions. Drawing from the allied fields of medicine, biology, psychology and anthropology, with a dash of computer science, LaFrance dissects the smile into its component parts and reassembles them into a potent force for both transparency and chicanery, friendship and enmity.
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