of lightning rods, had all unknowingly erected a super-powerful magnet for loose-flying vortices of atomic disintegration.

Nor were such vortices scarce. Every time an atomic powerplant went out of control, a loose atomic vortex resulted, and there was, at that time, no way of extinguishing them. It was theoretically possible to blow them out with duodec, but the charge of explosive had to match within very close limits the instantaneous value of the vortex's activity. Since that value varied rapidly and almost unpredictably, practically all such attempts resulted in the death of the operator and the creation of a dozen or more new centers of annihilation.

There was a possibility that Cloud, a mathematical prodigy able to compute instantaneously any mathematical problem, would be able to succeed where so many others had failed; but as long as he had Jo and the three kids, as long as he had the normal love of life, that possibility had never occurred to him.

When he lost them, however, he no longer had the slightest interest in living. Unwilling to kill himself, he decided to try to blow out the oldest and worst vortex upon Tellus. Against the orders of his chief and the pleadings of his friends he tried it. He succeeded.

He had been burned; he had been broken, but he carried no scars. The Phillips treatment for the replacement of lost or damaged members of the human body had taken care of that. His face looked youthful; his hard-schooled, resiliently responsive body was in startlingly fine condition for that of a man of forty.

The Phillips treatment could not, however, fill a dully aching void within him. It could not eradicate from mind and soul the absence of and the overpowering longing for his deceased wife and children—particularly his wife, Jo the lovely, Jo the beloved, Jo his all in all for eighteen fleeting and intensely happy years.

He no longer wore that psychic trauma visibly; it no longer came obtrusively between him and those with whom he worked, but it was and always would be there. He had by this time blown out so many vortices and had developed such an effective technique that he no longer had any hope that any vortex could ever kill him—but there were other forms of death. He still would not actually court it; but more and more certainly, as the days dragged on, he came to know that not by one single millimeter would he dodge anyone or anything bringing the dread messenger his way.

"Where do you want me to go next, Chief?" the Vortex Blaster asked. "Spica or Rigel 

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