text: The FACS is very helpful for humans that performs the same impressive "calculation" everyday. Of course, most of us can probably tell how a friend is feeling by the look of there face , you can probably tell by the look of there faces when they are happy, sad, worried that why Lenardo da Vinci made the Mona Lisa picture and his crew from making the FACS technology. The author is giving us the mood of encouraging because without the FACS technology then we would never know how people feel when it comes down to the people that don't show emotions.