Asimov proposed a sequel about a robot that could read minds. Campbell liked it, and after they had tossed the idea back and forth, the editor said, “Look, Asimov, in working this out, you have to realize that there are three rules that robots have to follow. In the first place, they can’t do any harm to human beings; in the second place, they have to obey orders without doing harm; in the third, they have to protect themselves, without doing harm or proving disobedient.” The result, after some refinement, would become known as Three Laws of Robotics, and their impact would be felt endlessly
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