text: In conclusion NASA is over reacting over this face on mars because they think aliens did it, they been taking alot of photos, and they been showing it to the public. I think NASA should stop taking photos and reasearching the face because its a butte or a mesa.            The use of the facial action coding system is a must have in class rooms. It will help tell if the students understand the work there doing. It also will help if they see a student unhappy or depressed we can tell there parents that they should get help to see if there ok. Also it can find if the students are understanding the work and so they can help their fellow students with work.