text: Another reason why this is valueable technology for classroom use is because teachers can see how the student is feeling about the lesson. In paragraph 6, it also states " Imagine a computer knows when you're happy or sad. For example, if you smile when a web as appears on your screen, a similar ad might follow. But if your frown, the next ad will be different." This could also be applied to a teacher. If the teacher sees that the lesson is making the students happy they can go on teaching the way they are teaching.