It can be awfully cute when babies smile in their sleep—but is it a real smile, or just a reflex? We turned to experts to learn more. Among all of your baby’s first milestones, smiling is arguably one ...

For humans, flashing a smile is an easy way to avoid misunderstanding. And, according to a new study, bottlenose dolphins may use a similar tactic while playing with each other. The study, which was ...

Smiling during conversations creates warmth, making people feel more comfortable and connected. For example, a friendly smile when meeting someone new can ease nervousness. A smile can soften tension ...