I remember being amused to learn that psychology folks call a real smile a “Duchenne” smile, and that the tell, to them, is that a Duchenne smile forms creases

I remember being amused to learn that psychology folks call a real smile a “Duchenne” smile, and that the tell, to them, is that a Duchenne smile forms creases around the corners of the eyes. To hear Ekman, father of the Facial Action Coding System, tell it: https://www.paulekman.com/blog/fake-smile-or-genuine-smile/ https://www.paulekman.com/blog/fake-smile-or-genuine-smile/