text: Things would go so much easier and smoother if teachers could tell when someone is upset. They could help them by talking to them about it and maybe giving them some advice or recommend them someone to talk to. Luckily with the help of a "Facial Action Coding System", which was invented by Dr. Paul Eckman, teachers could see what students are actually feeling. I know crazy right? But just imagine being able to see someones hidden emotions.