Así surgió en la ciudad una gran clase de proletarios (Esta palabra proviene de una voz latina que significa - Isaac Asimov

"The girl who wore only a pair of shorts said, "It was the university that called down the Darkness on us." "And the Stars," said the man who wore just a shirt. "They brought the Stars." "And this one might bring them back," said the woman who had spoken before. "Get him out of here! Get him out of here!" Sheerin stared incredulously. He told himself that he should have been able to predict this. It was an all too likely development: pathological suspicion of all scientists, all educated people, an unreasoning phobia that must be raging now like a virus among the survivors of the night of terror."

A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.

A comida, diferente daquela que ele vira os outros comendo, estava fria; mas isso era um detalhe. Só depois de um minuto é que percebeu que a comida estava sendo aquecida e que o recipiente ficara quente ao toque. Ele parou, alarmado, e esperou.