“By their own efforts!” insisted Herbie.

“But they want it, and the fact that you have it and won’t give it hurts them. You see that, don’t you?”

“Yes! Yes!”

“And if you tell them, that will hurt them, too.”

“Yes! Yes!” Herbie was retreating slowly, and step by step Susan Calvin advanced. The two men watched in frozen bewilderment.

“You can’t tell them,” droned the psychologist slowly, “because that would hurt and you mustn’t hurt. But if you don’t tell them, you hurt, so you must tell them. And if you do, you will hurt and you mustn’t, so you can’t tell them; but if you don’t, you hurt, so you must; but if you do, you hurt, so you mustn’t; but if you don’t, you hurt, so you must; but if you do, you — ”

Herbie was up against the wall, and here he dropped to his knees. “Stop!” he shrieked. “Close your mind! It is full of pain and frustration and hate! I didn’t mean it, I tell you! I tried to help! I told you what you wanted to hear. I had to!”

The psychologist paid no attention, “You must tell them, but if you do, you hurt, so you musn’t; but if you don’t, you hurt, so you must; but — ”

And Herbie screamed!

It was like the whistling of a piccolo many times magnified — shrill and shriller till it keened with the terror of a lost soul and filled the room with the piercingness of itself.

And when it died into nothingness, Herbie collapsed into a huddled heap of motionless metal.

Bogert’s face was bloodless, “He’s dead!”

“No!” Susan Calvin burst into body-racking gusts of wild^ laughter, “not dead — merely insane. I confronted him with the insoluble dilemma, and he broke down. You can scrap him now — because he’ll never speak again.”

Lanning was on his knees beside the thing that had been Herbie. His fingers touched the cold, unresponsive metal face and he shuddered. “You did that on purpose.” He rose and faced her, face contorted.