text: It is clear that cars are a problem. But many people use them anyway, but what they don't think about is how much they are contributing to polution. Some ways to limit car usage are create cities where you have to pay for a place to store you car, have and even odd licens day, and have no car days. So now the shoice is yours will you continue driving all the time or will you limit the amount you drive?    I think that using the techonogy to read student emotional expression of student in a class is valuable because it help to see if a student is happy/mad/sad .Like in the passage it's talking about how they are using this new technology call ''The Facial Action coding system ''Which mean -a system enables computers to identify human emotions . They are aslo using the 3-D computer model of the face ,As they can aslo calculate the emotions