I accept nothing on authority. A hypothesis must be backed by reason, or else it is worthless. — Isaac Asimov

“Fifty years,” I hackneyed, “is a long time.”

“Not when you’re looking back at them,” she said. “You wonder how they vanished so quickly.”

Milton Ashe is not the type to marry a head of hair and a pair of eyes.

“Nonsense,” Weston denied, with an involuntary nervous shiver. “That’s completely ridiculous. We had a long discussion at the time we bought Robbie about the First Law of Robotics. You know that it is impossible for a robot to harm a human being; that long before enough can go wrong to alter that First Law, a robot would be completely inoperable. It’s a mathematical impossibility. Besides I have an engineer from U.S. Robots here twice a year to give the poor gadget a complete overhaul. Why, there’s no more chance of anything at all going wrong with Robbie than there is of you or I suddenly going looney—considerably less, in fact.”