It was here, in his private workshop, that he had developed his "hunch" to startling reality. Working in his spare time, figuring out its mathematical components, then working those components into theoretical diagrams, then designing and building the machine to fit the diagrams--and it worked! Also, it was fantastic. It had been a little too fantastic for him to mention it to any of the others at the labs. His fellow-engineers--some of whom were considerably older than he was--were a little too staid for that. They, too, were products of the age; their entire efforts and, indeed, most of their interests were tied up in the one, basic problem of making better electronic devices for better weapons for the Armed Forces. They couldn't be blamed for that, the world situation being what it was, but it did make them somewhat hide-bound. The idea of controlling the pull of gravity was a little too fanciful for them, Morrow feared--or if they had any interest in the idea at all, it would be in the possible uses of it as a military weapon. That was the way to get ahead as a scientist, these days! Morrow shuddered involuntarily. _There_ was the thing he actually feared! He drew it into his thoughts, slowly, and analysed it. Item: he had discovered a means of controlling gravity. Item: he had developed a mechanism which worked on that principle. Addenda: the mechanism could lift a human being, quite possibly as much mass as a heavy tank, and it might even open the way to interplanetary travel. Quite obviously, it had terrific potentialities as a weapon of war. And it was his patriotic duty, as a citizen of the United States, to turn his discovery over to the authorities. Well, suppose he did? It would come as an even greater shock than was the development of the atomic bomb--of that, he was sure. It would become a top-secret project. Gradually, each individual unit of the entire Armed Forces would be made airborne. The Infantry would take to the skies, supported by airborne artillery and tanks; the Air Force and Navy would combine to send giant battleships gliding through the stratosphere, unhindered by any shore-line and capable of both artillery fire and aerial bombardment. How could anything as big as that be kept secret? The answer was, it couldn't. Such a program would hardly have begun when some Russian agent handed the entire secret over to his bosses in the Kremlin. Then Russia would launch the same sort of program. And world tension was already terrific. Mankind was already teetering on the brink of atomic war. What psychological effect would this new threat have on them? What insults would the diplomats think of, then? What charges and counter-charges would hurl between them? What final "incident" would spark the entire civilization into a raging holocaust?