text: Knowing how to keep someone interested with what they are doing is a huge challenge. Sometimes people get bored with what they are doing and don't want to do it anymore. The computer could tell that you are getting bored and will try a variety of things until they find one that you are interested in. For example " If you smile when a Web ad appears on your screen, a similar ad might follow. But if you frown, the next ad wil be different" (Paragraph 6).