Mike Suda, The Wall Street Journal Holding the sticks in the mouth activates the same muscles we use for smiling. After engaging in stressful tasks, people reduced their heart rate more quickly if they smiled, a recent study found. Participants held chopsticks in their mouth in different ways to, from left, keep a neutral expression,…

Sumathi Reddy, The Wall Street Journal Researchers are finding that wearing a smile brings certain benefits, like slowing down the heart and reducing stress. This may even happen when people aren’t aware they are forming a smile, according to a recent study. The work follows research that established that the act of smiling can make…