“The word “smile” doesn’t even exist in Latin or Ancient Greek. Smiling was an invention of the Middle Ages, and broad, toothy-mouthed smiles (with crinkling at the eyes, named the Duchenne smile by Ekman) became popular only in the eighteenth… — Lisa Feldman Barrett Copy Share Image
“Researches of behavioural science have shown that the presentation of flowers to someone almost always guarantees a Duchenne smile - a facial expression of genuine pleasure.” — Constance Kirker Copy Share Image
