Within 400 milliseconds, your brain and face begin responding to another person's smile, setting off a cascade that researchers are only beginning to understand.

One of my favorite things to do when I’m out and about is smile at people. The responses to this are varied. Sometimes, I get no response because they never notice me smiling at them. But sometimes, I ...

When life feels stressful or overwhelming, smiling can be one way to bring more peace to the chaos. We usually think of smiles as a reaction to feeling happy. But there are several reasons to make the ...