"ENIAC," the robot corrected, capitalizing. "ENIAC Gamma the Ninety-Third."

So saying, he unslung a sack from his metallic shoulder and began to rummage out length upon length of what looked like red silk ribbon with a curious metallic lustre. After approximately a quarter-mile of it had appeared, a crystal football helmet emerged attached to its end. A gleaming red-green stone was set on each side of the helmet.

"Just over the temporal lobes, you see," the robot explained, indicating the jewels. "Now you just set it on your head, like this—"

"Oh no I don't," Martin said, withdrawing his head with the utmost rapidity. "Neither do you, my friend. What's the idea? I don't like the looks of that gimmick. I particularly don't like those two red garnets on the sides. They look like eyes."

"Those are artificial eclogite," the robot assured him. "They simply have a high dielectric constant. It's merely a matter of altering the normal thresholds of the neuron memory-circuits. All thinking is based on memory, you know. The strength of your associations—the emotional indices of your memories—channel your actions and decisions, and the ecologizer simply changes the voltage of your brain so the thresholds are altered."

"Is that all it does?" Martin asked suspiciously.

"Well, now," the robot said with a slight air of evasion. "I didn't intend to mention it, but since you ask—it also imposes the master-matrix of your character type. But since that's the prototype of your character in the first place, it will simply enable you to make the most of your potential ability, hereditary and acquired. It will make you react to your environment in the way that best assures your survival."

"Not me, it won't," Martin said firmly. "Because you aren't going to put that thing on my head."

The robot sketched a puzzled frown. "Oh," he said after a pause. "I haven't explained yet, have I? It's very simple. Would you be willing to take part in a valuable socio-cultural experiment for the benefit of all mankind?"

"No," Martin said.

"But you don't know what it is yet," the robot said plaintively. "You'll be the only one to refuse, after I've explained everything thoroughly. By the way, can you understand me all right?"

Martin laughed hollowly. "Natch," he 

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