Discover how the Duchenne smile—characterized by crinkling eyes—differs from ordinary smiles, demonstrating a true expression ...

Add Yahoo as a preferred source to see more of our stories on Google. Paul Allen’s Estate reaches tentative agreement to sell Seahawks for reported $9.6B A planetary alignment early Friday morning ...

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.

Research shows a 20-second fake smile ‘improves physiology during acute stress, improves stress recover, and reduces illness over time.’ Can’t beat that.

Imagine meeting someone new whose smile feels just a bit wrong. You might think, "this smile is too fast (or slow, or crooked ...