text: The reason i think it's not valuable is because what do you need to know how people is feeling or not before? If it really was a problem with them they would come up and tell the teacher what's wrong with them. Like for example you can be smiling all day in still not be happy about something. So if it just goes off your facial expressions than i don't think it is valuable. On the other hand if it can see what you really are thinking than maybe it is a little valuable to the students and teahcers at school. So it really depends on how the technology works to really know if it's valuable or not.