text: I think this machine could be very useful in different situations like in offices, classrooms and even in personal homes. I would like it in classroom because it could tell whether students have a problem with something. I think this software could be a great thing for a classroom. Imagine a classroom computer that knows when you are happy or sad. For exapmle, if you smile when a Web ad appears on your screen a similar ad might follow it. But if you frown, the next ad will be something different.