“Here’s our theory,” the expert said. “We keep looking for contact, a trigger in the pseudopodium. But more likely we’re witnessing a psychological phenomena, a decision without any physical correlative. We’re watching for something that isn’t there. The mine decides to blow up. It sees our ship, approaches, and then decides.”

“Thanks.” Kramer turned to Gross. “Well, that confirms what I’m saying. How can a ship guided by automatic relays escape a mine that decides to explode? The whole theory of mine penetration is that you must avoid tripping the trigger. But here the trigger is a state of mind in a complicated, developed life-form.”

“The belt is fifty thousand miles deep,” Gross added. “It solves another problem for them, repair and maintenance. The damn things reproduce, fill up the spaces by spawning into them. I wonder what they feed on?”

“Probably the remains of our first-line. The big cruisers must be a delicacy. It’s a game of wits, between a living creature and a ship piloted by automatic relays. The ship always loses.” Kramer opened a folder. “I’ll tell you what I suggest.”

“Go on,” Gross said. “I’ve already heard ten solutions today. What’s yours?”

“Mine is very simple. These creatures are superior to any mechanical system, but only because they’re alive. Almost any other life-form could compete with them, any higher life-form. If the yuks can put out living mines to protect their planets, we ought to be able to harness some of our own life-forms in a similar way. Let’s make use of the same weapon ourselves.”

“Which life-form do you propose to use?”

“I think the human brain is the most agile of known living forms. Do you know of any better?”

“But no human being can withstand outspace travel. A human pilot would be dead of heart failure long before the ship got anywhere near Proxima.”

“But we don’t need the whole body,” Kramer said. “We need only the brain.”

“What?”

“The problem is to find a person of high intelligence who would contribute, in the same manner that eyes and arms are volunteered.”

“But a brain….”

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