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 ...

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 ...

Discover 25 weird facts about how personality shapes your face. From chronic emotions to lifestyle, learn how your inner ...

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 ...