text: In paragraph 4, sentence 3, it states that, "By weighting the different units, the software can even identify mixed emotions." As I said before, it is very hard to teach a lesson and study people's faces at the same time, so when the computer finds out who's upset, it will benefit the teacher very much. If it's something inside the classroom that's bothering them, the teacher can talk to the student about it, whether they're confused or just don't like the way they're being taught. Let's say, for example, the student doesn't like the teaching style and the teacher talks to them about it. The teacher then changes what that student doesn't like and in turn there is an increase in the willingness to participate in class.