"We would have had to arrest him eventually, anyway," said Brian Taggert.

"Give me a quick run-down," Gonzales said. "I"ve got to explain this to the President."

"Did you ever hear of the Pauli Effect?" MacHeath asked.

"Something about the number of electrons that--"

"No," MacHeath said quickly. "That"s the Pauli _principle_, better known as the Exclusion Principle. The Pauli _Effect_ is a different thing entirely, a psionic effect.

"It used to be said that a theoretical physicist was judged by his inability to handle research apparatus; the clumsier he was in research, the better he was with theory. But Wolfgang Pauli was a lot more than clumsy. Apparatus would break, topple over, go to pieces, or burn up if Pauli just walked into the room.

"Up to the time he died, in 1958, his colleagues kidded about it, without really believing there was anything behind it. But it is recorded that the explosion of some vacuum equipment in a laboratory at the University of Gottingen was the direct result of the Pauli Effect. It was definitely established that the explosion occurred at the precise moment that a train on which Pauli was traveling stopped for a short time at the Gottingen railway station."

The senator said: "The poltergeist phenomenon."

"Not exactly," MacHeath said, "although there is a similarity. The poltergeist phenomenon is usually spectacular and is nearly always a.s.sociated with teen-age neurotics. Then there"s the pyrotic; fires always start in his vicinity."

"But there"s always a reason for psionic phenomena to react violently under subconscious control," Senator Gonzales pointed out. "There"s always a psychological quirk."

"Sure. And I almost fell into the same trap, myself."

"How so?"

"I was thinking that if Bern were the saboteur, all our theories about psionics would have to be thrown out--we"d have to start from a different set of precepts. _And I didn"t even want to think about such an idea!_"

"n.o.body likes their pet theories overthrown," Gonzales observed.

"Of course not. But here"s the point: The only way that a scientific theory can be proved wrong is to uncover a phenomenon which doesn"t fit in with the theory. A theoretical physicist is a mathematician; he makes logical deductions and logical predictions by juggling symbols around in accordance with some logical system. But the axioms, the a.s.sumptions upon which those systems are built, are nonlogical. You can"t prove an axiom; if comes right out of the mind.

"So imagine that you"re a theoretical physicist. A really original-type thinker. You come up with a mathematical system that explains all known phenomena at that time, and predicts others that are, as yet, unknown. You check your math over and over again; there"s no error in your logic, since it all follows, step by step."

"O.K.; go on," Gonzales said interestedly.

"Very well, then; you"ve built yourself a logical universe, based on your axioms, and the structure seems to have a one-to-one correspondence with the actual universe. Not only that, but if the theory is accepted, you"ve built your reputation on it--your life.

"Now, what happens if your axioms--not the logic _about_ the axioms, but the axioms themselves--are proven to be wrong?"

Brian Taggert took his pipe out of his mouth. "Why, you give up the erroneous set of axioms and build a new set that will explain the new phenomenon. Isn"t that what a scientist is supposed to do?" His manner was that of wide-eyed innocence laid on with a large trowel.

"Oh, _sure_ it is," said the senator. "A man builds his whole life, his whole universe; on a set of principles, and he sc.r.a.ps them at the drop of a hat. _Sure_ he does."

"He claims he will," MacHeath said. "Any scientist worth the paper his diploma is printed on is firmly convinced that he will change his axioms as soon as they"re proven false. Of course, ninety-nine per cent of "em _can"t_ and _won"t_ and _don"t_. They refuse to look at anything that suggests changing axioms.

"Some scientists eagerly accept the axioms that they were taught in school and hang on to them all their lives, fighting change tooth and nail. Oh, they"ll accept new ideas, all right--provided that they fit in with the structures based on the old axioms.

"Then there are the young iconoclasts who don"t like the axioms as they stand, so they make up some new ones of their own--men like Newton, Einstein, Planck, and so on. Then, once the new axioms have been forced down the throats of their colleagues, the innovators become the Old Order; the iconoclasts become the ones who put the fences around the new images to safeguard them. And they"re even more firmly wedded to their axioms than anyone else. This is _their_ universe!

"Of course, these men proclaim to all the world that they are perfectly willing to change their axioms. And the better a scientist he is, the more he believes, in his heart-of-hearts, that he really would change. He really thinks, consciously, that he wants others to test his theories.

"But notice: A theory is only good if it explains all known phenomena in its field. If it does, then the only thing that can topple it is a _new_ fact. The only thing that can threaten the complex structure formulated by a really creative, painstaking, mathematical physicist is _experiment_!"

Senator Gonzales" attentive silence was eloquent.

"Experiment!" MacHeath repeated. "That can wreck a theory quicker and more completely than all the learned arguments of a dozen men. And every theoretician is aware of that fact. Consciously, he gladly accepts the inevitable; but his subconscious mind will fight to keep those axioms.

"_Even if it has to smash every experimental device around!_

"After all, if n.o.body can experiment on your theory, it can"t be proved wrong, can it?

"In Nordred"s case, as in Pauli"s, this subconscious defense actually made itself felt in the form of broken equipment. Dr. Theodore Nordred was totally unconscious of the fact that he detested and feared the idea of anyone experimenting to prove or disprove his theory. He had no idea that he, himself, was re-channeling the energy in those machines to make them burn out."

Brian Taggert looked at MacHeath pointedly. "Do you think the shock treatment you gave him will cause any repercussions?"

"No. Griffin and Benbow held that block of radiolead floating in the air only while Dr. Nordred was alone in the lab. He pushed at it, felt of it, and moved it around for more than ten minutes before he"d admit the reality of what he saw. Then he called Luvochek and Bessermann in to look at it.

"Griffin and Benbow let the sample settle to the desk, so that by the time the other two scientists got to the lab, the lead didn"t have an apparent negative weight, but was still much lighter than it should be.

"All the while that Bessermann and Luvochek were trying to weigh the lead block, to get an accurate measurement, Griffin and Benbow, three rooms away, kept increasing the weight slowly towards normal. And so far no one has invented a device which will give an instantaneous check on the weight of an object. A balance can"t check the weight of a sample unless that weight is constant; there"s too much time lag involved.

"So, what evidence do they have? Scientifically speaking, none. They have no measurements, and the experiment can"t be repeated. And only Nordred actually saw the sample _floating_. Luvochek and Bessermann will eventually think up a "natural" explanation for the apparent steady gain in weight. Only Nordred will remain convinced that what he saw actually happened.

"I don"t see how there could be any serious repercussions in the field of physics." But he looked at Taggert for confirmation.

Taggert gave it to him with an approving look.

"It"s a funny thing," said Gonzales musingly. "Some time back, we were in a situation where we had to go to the extreme of physical violence to keep from demonstrating to a scientist that psionic powers could be controlled, just to keep from ruining the physicist"s work.

"Now, we turn right around and demonstrate the "impossible" to another physicist in order to pull his hard-earned axioms out from under him."

He smiled wryly. "There ain"t no justice in the world."

"No," agreed MacHeath, "but the trick worked. He won"t have any subconscious desire to smash equipment just to protect a theory that has already been smashed. On the contrary, he"ll let them go through in order to find new data to build another theory on."

"He"ll never again be the man he was," said Taggert regretfully. "He"s lost the force of his convictions. He won"t be capable of taking a no-nonsense, dogmatic, black-and-white stand. But it was necessary."

He made an odd gesture with one hand. "What else can you do with a man who"s a psionic psychopath?"

THE END