"It's very simple," the Cyberene said. "It will never forget once it learns something. Before its mind integrates into a self aware ego, attach a relay to some motor outlets. Decide on some key combination of sounds that might be spoken. Repeat them into the auditory centers of the Brain, at the same time tripping the relay. Keep doing that until utterance of the sequence of sounds causes the relay to trip. When that response is automatic, connect the relay to the loudspeaker. Once you have done that, report to me. Then all I need do is contact the second Cyberene, in this age, and if I want to destroy it I can repeat the sounds." Earl, in his mental cubicle, chuckled. He could not have thought of a better way himself. "And," the Cyberene said, "in order to account for your task, you had better 'sell' Glassman on the idea. Tell him it's so that _mankind_ can destroy the Brain if necessary. But make sure no one in 1980 knows the key sounds. You may return to 1980." * * * * * "I've had much the same thought," Victor Glassman said, chewing on his lip. "I rather hated to think about it though. Destroy my Creation? Still, I suppose it's wise--to be _able_ to." He stood up and came around from behind his desk. Earl and Nadine watched without speaking as he clasped his hands behind his back and went to the window of his office which brought him a view of part of the giant dome housing the Brain. "Every precaution is being taken otherwise. Until we can be sure of ourselves we don't intend on letting the Brain have control of any machines or weapons. Of course we could forget that danger, in time, and suddenly wake up to the fact that we were too late. Then it would be nice to still be able to.... All right. Go ahead. Keep it under your hats though. And when you're done we can form a select group, handing the--" he smiled wryly,--"password down from generation to generation." "I have the plans all drawn up," Earl said. "An electrostatic speaker, because it can be built with parts that will last forever. No moving parts in the frequency generator or amplifier. Leads to the permanent busses that will supply current for such things as video eyes and the voice speaker system...." "Good. Good. Only we will indoctrinate that Mind early so that it will never do anything detrimental to us." "Of course," Earl soothed. "This is only precautionary." * * * * * Days followed one another swiftly. A factory-made electrostatic loudspeaker arrived, and was dismantled so that some of its parts could be replaced with more durable ones. Specifications for the frequency generators and the amplifier were farmed out, and the completed units arrived.