Like You Mean It: The 19 Types of Smiles — And The Six ‘Real’ Ones (BBC)

Out of the 19 types of smiles, only six indicate happiness. In 1924, Carney Landis—a grad student at the University of Minnesota—hoped to determine whether certain experiences such as pain or shock always evoked the same facial expressions.

During the experiment, even the most violent tasks triggered smiles from his subjects. The BBC explains the smiles that do not connote happiness.

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