This is a novel book. She nodded slowly, staring at nothingness. Oh, she realized, all right, realized only too well. It was the world that hadn't realized. The world that had gone on stockpiling hydrogen bombs. The world that had put those bombs in cobalt shells, although it had promised it wouldn't, because the cobalt made them much more terrible and cost no more. The world that had started throwing those bombs, always telling itself that it hadn't thrown enough of them yet to make the air really dangerous with the deadly radioactive dust that came from the cobalt. Thrown them and kept on throwing until the danger point, where air and ground would become fatal to all human life, was approached. Then, for about a month, the two great enemy groups had hesitated. And then each, unknown to the other, had decided it could risk one last gigantic and decisive attack without exceeding the danger point. It had been planned to strip off the cobalt cases, but someone forgot and then there wasn't time. Besides, the military scientists of each group were confident that the lands of the other had got the most dust. The two attacks came within an hour of each other.