know how it happened. Ashe, I want you to check the factory, from the beginning to the end. Everything. And list any operations where there may have been a mistake.' Lanning turned to Calvin. "You must study the robot itself. As the psychologist of the company, you must find out how it works and whether it is normal in other ways. I'll work on the problem mathematically with Bogert, of course." Ashe pushed his chair back. "Since I've got the most difficult job, I'd better begin. Susan Calvin's eyes followed him as he left the room. RB-34's photoelectric eyes lifted from the book when the door opened and Susan Calvin entered. "I've brought you some more books on atomic engines, Herbie,' she said. Herbie lifted the three heavy books from her arms. "Sit down, Dr Calvin. This will take me a few minutes. The psychologist sat down and watched Herbie as he went through the books carefully. At the end of half an hour he had finished. "These books don't interest me,' he said. "Your science is just an enormous collection of facts, loosely connected by rather unclear ideas. It's so simple that I don't want to bother with it. I want to read your novels, your stories, to find out how your minds work, and to learn about human feelings. Dr Calvin whispered, I think I understand. "I see into human minds, you see," the robot continued. You have no idea how complicated they are. I can't understand everything, because my own mind is so