Whenever I mention mermaids, I notice the emergence of Duchenne smiles on the faces of all the men in my circle.
What is a Duchenne smile?
Very simply, it is a smile that is characterized by the raising of the lip corners which in turn raise the cheeks and form crow’s feet around the eyes. French physician Guillaume Duchenne first recognized this smile while conducting research on the physiology of facial expressions in the mid 19th century. According to Duchenne, that distinctive smile is associated with a strong positive emotion.
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