text: In the text it say's that if you make a bad face to a ad on the browser the ad will not be like the other one you didn't like. And if you simle at an ad the next one will be more simlar to the one you like. Its a good thing for your phone or PC to able to read your face experssion and can tell when you like something or when you don't. Another thing is if you work to hard or you don't understand, the 3-D can modify the test or work in other words it modify the work to the best way you can understand.