Women who displayed a Duchenne smile in their college yearbook photos were found to report feeling happy and competent decades after graduation.

This statement is true. A study conducted by researchers at the University of California, Berkeley found that women who displayed a Duchenne smile in their college yearbook photos reported experiencing more positive emotions and showing more confidence in their abilities when they were interviewed decades later. A Duchenne smile is a genuine smile that involves movement of the muscles around the eyes in addition to the mouth, indicating true happiness.