Keira Knightley and Kristen Stewart are its best ambassadors. Instead of curving upwards, their mouths curve downwards, ...

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 ...

Often called the world’s most famous face reader, he inspired the TV show ‘Lie to Me.’ But some questioned his assumption that human expressions were ‘pan-cultural.’ Credit: Gemma Cubero del ...