text: Facial Action Coding System has classified six basic emotion- happiness, surprise, anger, disgust, fear, and sadness and then associates each with characteristic movements of the facial muscles. The coding system could tell if the student is telling the truth or lying. To an expert, faces dont lie; these muscle clues are sometimes used to spot when a smiling politician or celebrity isnt being truthful. By weighting the diffrient units, the software can even identify mixed emotions.