text: For a classroom it can valuable like after lunch every student must use it before starting class to check how they're feeing. It will very useful if a student is sad or angry percent is high. It can give the teacher a reasoning to go up to the student and ask, why are you sad or why your angry. It can be very valuable like if a student just went through a terrible situation and the teacher can try to help cheer them up. One downside is that it can give out a students business and if like a student is sad, it can become a joke to the other students and make that student even more sad. It also identify if your making a fake smile or not as it can tell by how you make your smile like, if you make a fake smile your mouth is stretched sideways, as in a real smile your zygomtic major(that begin at your cheek bonees) lift the corners of your mouth.