text: First, having a facial recognition system to detect your emotions in class would be too discrating to the students because they would have something monitoring their faces the whole class period. Not to mention, it would be in all of their classes. Evidence from the text to support this would be, "Then it could modify the lesson, like an effective human instructor." That would waste a lot of time to stop everytime one student gets confused of bored. Classes don't have enough time to do that and it would get them very behind.