On the first trip Earl retreated from his conscious mind as much as possible, while still watching everything around him closely. He had been inside the Brain many times before--but never with any thought of discovering a weakness where it could be destroyed. That was the task he had set himself. It was an almost impossible one. Destroying the Brain now, in 1980, might not accomplish his purpose. The damage could be repaired. He thought of dynamite and rejected it. It would deteriorate long before 3042, and even if it remained potent, it would do no more than damage a small part of the Brain--not enough to more than partially impair its thinking or give it a case of specialized forgetfulness. A dynamite explosion in such an enormous brain would be equivalent to a blood clot on a human brain. Nothing better presented itself to him on that first trip. Was he going to fail? The next day pumping of the nerve fluid began. The masses of hair-fine glass tubing lost their appearance of glass wool and began to appear as individual threads of yellowish orange. It would be many days before the "loading", as it was termed, would be completed, but everyone was kept busy watching it, and catching broken threads as they started to ooze fluid, sealing them with a special formula sealer. During these days a dozen plans to destroy the Brain occurred to Earl. Each had its defects that would make it fail. As the "loading" neared its last day, only one possibility remained. Great precautions had been taken to make the Brain free from vibration. The slightest sound of almost any frequency, if continued long enough, would find a nerve strand that would vibrate to it and snap. A loudspeaker broadcasting at full power over the entire range of sound would be more devastating to the Brain than a ton of dynamite exploded in its heart. There was the answer--Vibration! But once again there was the problem of installing it, and being able to use it after a thousand years. Install it and use a clock to trigger it? That was one possibility. Clocks run by atomic power would keep accurate time over much longer periods. _But there was the problem of getting the Cyberene to agree to the installation of such a device._ That was necessary. During the days that Earl had studied the Cyberene's control of his conscious mind he had found no way to gain any sort of positive control which the Cyberene couldn't shunt out at once. Therefore whatever plan he devised must meet with the approval of the Cyberene. Tentatively he inserted a bold thought, feeling sure that the Cyberene wouldn't attribute it to him, but merely to the logical processes of his conscious mind.