text: and there is sadness. They associated with each of our characteristics movements of the facial muscules. "The facial expressions for each emotion are universal." We have some software tracks on these facial movement that our brain follows, it can find out you're mix emotion and expression by you're neutral face. This not means what you can really see without the tech and just see the real feeling and the real smile or their sadness. This Facial Action Coding System is identifing the moment of the face right that minute, but not what they are feeling right after or before.