You prepared thoroughly for a presentation at work, and now you’re dropping wisdom to a packed room. Much as you expected, your colleagues appear wowed and ...

Facial expressions play a fundamental role in social communication. While it is well established that others’ expressions influence our behavior—such as approaching a smiling person or avoiding an ...

When a baby smiles at you, it's almost impossible not to smile back. This spontaneous reaction to a facial expression is part of the back-and-forth that allows us to understand each other's emotions ...

Keira Knightley and Kristen Stewart are its best ambassadors. Instead of curving upwards, their mouths curve downwards, giving them a unique charm. The inverted smile, which doesn't follow the usual ...