Why we find smiles so attractive

Unlike most species, humans bare their teeth not as a sign of aggression, but as an affable gesture. Smiling is also an intrinsic human behavior. When speaking to Scientific American, Frank McAndrew, a professor of psychology at Knox College in Galesburg, Illinois, who has spent much time studying facial expressions, dubbed smiling a “preprogrammed behavior.” He explained, saying, “Kids who are born blind never see anybody smile, but they show the same kinds of smiles under the same situations as sighted people.”

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