He got no laughs, went on: "But it doesn't weigh enough; we're safe. This dummy has been prepared so that Dr. Reyn­olds' people will have an image to help them concentrate. It looks no more like an atom bomb than I look like Stalin, but it represents—if it were plutonium—what we atom tinker­ers call a ‘subcritical mass.' Since the spy trials everybody knows how an atom bomb works. Plutonium gives off neutrons at a constant rate. If the mass is small, most of them escape to the outside. But if it is large enough, or a critical mass, enough are absorbed by other nuclei to start a chain reaction. The trick is to assemble a critical mass quickly— then run for your life! This happens in microseconds; I can't be specific without upsetting the security officer.

"Today we will find out if the mind can change the rate of neutron emission in plutonium. By theories sound enough to have destroyed two Japanese cities, the emission of any particular neutron is pure chance, but the total emission is as invariable as the stars in their courses. Otherwise it would be impossible to make atom bombs.

"By standard theory, theory that works, that subcritical mass out there is no more likely to explode than a pumpkin. Our test group will try to change that. They will con­centrate, try to increase the probability of neutrons' escaping, and thus set off that sphere as an atom bomb."

"Doctor Satterlee?" asked a vice admiral with wings. "Do you think it can be done?"

"Absolutely not!" Satterlee turned to the adepts. "No of­fense intended, folks."

"Five minutes!" announced the navy captain.

Satterlee nodded to Reynolds. "Take over. And good luck." Mrs. Wilkins spoke up. "Just a moment, young man. These ‘neuter' things. I—"

"Neutrons, madam."

"That's what I said. I don't quite understand. I suppose that sort of thing comes in high school, but I only finished eighth grade. I'm sorry."

Satterlee looked sorry, too, but, he tried. "—and each of these nuclei is potentially able to spit out one of these little neutrons. In that sphere out there"—he held up the dummy—"There are, say, five thousand billion trillion nuclei, each one—"

"My, that's quite a lot, isn't it?"

"Madam, it certainly is. Now—"'

"Two minutes!"

Reynolds interrupted. "Mrs.. Wilkins, don't worry. Con­centrate on that metal ball out there and think about those neutrons, each one ready to come out. When I give the word, I want you all—you especially, Norman—to think about that ball, spitting sparks like a watch dial. Try for more sparks. Simply try. It you fail, no one will blame you. Don't get tense."

Mrs. Wilkins nodded. "I'll try." She put her tatting down and got a faraway look.

At once they were blinded by unbelievable radiance burst­ing through the massive filter. It beat on them, then died away.

The naval captain said, "What the hell!" Someone screamed, "It's gone, it's gone!"

The speaker brayed: "Fission at minus one minute thirty-seven seconds. Control, what went wrong. It looks like a hy­drogen—"

The concussion wave hit and all sounds were smothered.

Lights went out, emergency lighting clicked on. The blockhouse heaved like a boat in a heavy sea. Their eyes were still dazzled, their ears assaulted by cannonading afternoise, and physicists were elbowing flag officers at the port, when an an­guished soprano cut through the din. "Oh, dear!"

Reynolds snapped, "What's the matter, Grandma? You all right?"

"Me? Oh, yes, yes—but I'm so sorry. I didn't mean to do it."

"Do what?"

"I was just feeling it out, thinking about all those little bitty neuters, ready to spit. But I didn't mean to make it go off—not till you told us to."

"Oh." Reynolds turned to ‘the rest. "Anyone else jump the gun?"

No one admitted it. Mrs. Wilkins said timidly, "I'm sorry, Doctor. Have they got another one? I'll be more careful."

Reynolds and Withers were seated in the officers' mess with coffee in front of them; the physicist paid no attention to his. His eyes glittered and his face twitched. "No limits! Calculations show over ninety per cent conversion of mass to energy. You know what that means? If we assume—no, never mind. Just say that we could make every bomb the size of a pea. No tamper. No control circuits. Nothing but..." He paused. "Delivery would be fast, small jets—just a pilot, a weaponeer, and one of your ‘operators.' No limit to the number of bombs. No nation on earth could—"

"Take it easy," said Reynolds. "We've got only a few telekinesis operators. You wouldn't risk them in a plane."

"But—"

"You don't need to. Show them the bombs, give them photos of the targets, hook them by radio to the weaponeer. That spreads them thin. And we'll test for more sensitive people. My figures show about one in eighteen hundred."

"‘Spread them thin,'" repeated Withers.' "Mrs. Wilkins could handle dozens of bombs, one after another—couldn't she?"

"I suppose so. We'll test."

"We will indeed!" ‘Withers noticed his coffee, gulped it. "Forgive me, Doctor; I'm punchy. I've had to revise too many opinions."

"I know. I was a behaviorist."

Captain Mikeler came in, looked around and came over. "The General wants you both," he said softly. "Hurry."

They were ushered into a guarded office.. Major General Hanby was with General LaMott and Vice Admiral Keithley; they looked grim. Hanby handed them message flimsies. Reyn­olds saw the stamp TOP SECRET and handed his back. "Gen­eral, I'm not cleared for this,"

"Shut up and read it."

Reynolds skipped the number groups:

"—(PARAPHRASED) RUSSIAN EMBASSY TODAY HANDED STATE ULTIMATUM: DE­MANDS USA CONVERT TO ‘PEOPLE'S REPUBLIC' UNDER POLITICAL COMMISSARS TO BE ASSIGNED BY USSR. MILITARY ASSURANCES DEMANDED. NOTE CLAIMS MAJOR US CITIES (LIST SEPARATE) ARE MINED WITH ATOMIC BOMBS WHICH THEY THREATEN TO SET OFF BY RADIO IF TERMS ARE NOT MET BY SIXTEEN HUNDRED FRIDAY EST."

Reynolds reread it—"SIXTEEN HUNDRED FRIDAY"—Two P.M. day after tomorrow, local time. Our cities booby-trapped with A-bombs? Could they do that? He realized that LaMott was speaking. "We must assume that the threat is real. Our free organization makes it an obvious line of attack."

The admiral said, "They may be bluffing."

The air general shook his head. "They know the President won't surrender. We can't assume that Ivan is stupid."

Reynolds wondered why he was being allowed to hear this. LaMott looked at him. "Admiral Keithley and I leave for Washington at once. I have delayed to ask you this: your people set off an atom bomb. Can they keep bombs from going off?"

Reynolds felt his time sense stretch as if he had all year to think about Grandma Wilkins, Norman, his other paranor­mals. "Yes," he answered.

LaMott stood up. "Your job, Hanby. Coming, Admiral?"

"Wait!" protested Reynolds. "Give me one bomb and Mrs. Wilkins—and I'll sit on it. But how many cities? Twenty? Thirty?"

"Thirty-eight."

"Thirty-eight bombs—or more. Where are they? What do they look like? How long will this go on? It's impossible."

"Of course—but do it anyhow. Or try. Hanby, tell them we're on our way, will you?"

"Certainly, General."

"Good-by, Doctor. Or so long, rather."

Reynolds suddenly realized that these two were going back to "sit" on one of the bombs, to continue their duties until it killed them. He said quickly, "We'll try. We'll certainly try."

Thirty-eight cities, forty-three hours and seven­teen adepts. Others were listed in years of research, but they were scattered through forty-one states. In a dictatorship secret police would locate them at once, deliver them at super­sonic speeds. But this was America.