For his guardian against lightning had been a vortex-magnet at the moment when some luckless wight had tried to abate the nuisance of a “loose” atomic vortex. That wight dies, of course—they almost always did—and the vortex, instead of being destroyed, was simply broken up into a number of widely-scattered new vortices. And one of those bits of furious, uncontrolled energy, resembling a handful of substance torn from the depths of a sun, darted toward and shot downward to earth through Neal Cloud’s new house. That house did not burn; it exploded. Nothing of it, in it, or near it stood a chance, for in a few seconds the place where it had been was a crater of seething, boiling lava—a crater which filled the atmosphere with poisonous vapors; which flooded all nearby space with lethal radiations. Cosmically, the whole thing was infinitesimal. Ever since man learned how to use atomic power the vortices of disintegration had been breaking out of control. Such accidents had been happening, and would continue to happen. More than one world, perhaps, had been or would be consumed to the last gram by such loose atomic vortices. What of that? Of what real importance are a few grains of sand to a pile five thousand miles long, a hundred miles wide, and ten miles deep? Even to that individual grain of sand called “Earth”—or, in modern parlance, “Sol Three,” or “Tellus of Sol,” or simply “Tellus”—the affair was negligible. One man had died; but, in dying, he had added one more page to the thick bulk of negative results already on file. That Mrs. Cloud and her children had perished was merely unfortunate. The vortex itself was not yet a real threat to Tellus. It was a “new” one, and thus it would be a long time before it would become other than a local menace. Nor, to any except a tiny fraction of Earth’s inhabitants, was the question of loose atomic vortices a matter of concern. It was unthinkable that Tellus, the point of origin and the very center of Galactic Civilization, could cease to exist. Long before such vortices could eat away much of her mass, or poison much of her atmosphere, Earth’s scientists would have solved the problem. But to Neal Cloud the accident was ultimate catastrophe. His personal universe had crashed in ruins; what was left was not worth picking up. He and Jo had been married for more than fifteen years and the bonds between them had grown stronger, deeper, truer with every passing day. And the kids . . . it _couldn’t_ have happened . . . fate COULDN’T do this to him . . . but it had . . . it could. Gone . . . _gone_ . . . GONE! And to Neal Cloud, sitting there at his desk in black abstraction, with maggots of thought gnawing holes in his mind, the catastrophe was doubly galling because of its cruel irony. For he was second from the top in the Vortex Control Laboratory; his life’s work had been a search for a means or method of extinguishing loose atomic vortices.