Computer programs generate discussions between robots and humans. The humans rarely know when they are interacting with robots until/unless they notice that the replies are all alike all the time predictably. Human beings...that is to say THINKING human beings are unpredictable. Just when you think you got their number they go rogue on you and surprise you. Robots on the other hand never shock never surprise always predictable. Sameoldsameoldsameold.
Now it's not so easy when you know you are talking to a robot. They respond one level and cannot travel to any other anywhere. Ever. How many robots do you talk to daily?
