This is the reader’s first introduction to all three Rules of Robotics, which become crucial to all of the stories. These Three Laws set a very high ethical standard for the robots, particularly because of what the readers have already learned in “Robbie”: that robots will be inoperable before can could break any of these Three Laws. This is why, in Asimov’s stories, robots are often perceived to be better than human beings, because they are required to follow the Rules so strictly.