text: Using a classroom computer could recognize when a student is becoming confused or bored. Imagine a computer knows when we are happy or sad. Dr. Huang predicts that it could modify the lesson, like an effective human instructors. sometimes, it is hard for the teachers to guess the students. Human may know 50% of what they need acording to face emtions but the Face Action Coding System might know about 90% of human,s emotions by scanning their faces.