And, as he had been doing ever since beginning to work with Joan and her mechanical brains, he was passing up match after match, waiting to see whether or not the current brain could deliver the goods. There had been a long succession of them—Alice, Betty, Candace, Deirdre, and so on. This one was Lulu, and it didn’t look as though she was any good, either. He waited a while longer, however; then fined down his figures and got ready to blast. The flight-time of the bomb, under present atmospheric conditions, would be three point five nine eight seconds, plus or minus point zero zero one. His reaction time was point zero eight nine. . . . “Storm!” Joan broke in sharply, “Can you hold up a minute.” “Sure.” “That reaction time. I never spotted that before. Why didn’t I?” “I don’t know. Never thought of it. Lumped it in, you know. Separated it now, I suppose, because I’m working so slowly, to give Lulu more of a chance. Why?” “Because I’ve _got_ to know all the odd things about you, and that isn’t merely odd; it’s superhuman.” “Oh, I wouldn’t say that. Chickladorians average about point zero eight, and Vegians are still faster, about point zero seven. I checked up on that because they always test me three times when I renew my driver’s license and always pull a wise crack about me having a lot of cat blood in me. S’pose I could have?” “Um . . . m . . . m. Probably not . . . I don’t know for sure, but I don’t believe that a Tellurian-Vegian cross would be possible; and even if possible, such a hybrid couldn’t very well be fertile. But the more I find out about you, my friend, the more convinced I become that you’re either a mutant or else have some ancestors who were most decidedly _not_ Tellurians. But excuse this interruption, please—go ahead.” Cloud went. The flight time of the bomb, under present atmospheric conditions, would be three point five nine two seconds, plus or minus point zero zero two. His reaction time was point zero eight nine. In three point six eight one seconds the activity of the vortex would match bomb number eleven to within one-tenth of one percent. His left hand flashed out, number eleven firing stud snapped down. The vessel shuddered as though struck by a trip-hammer as the precisely-weighed charge of propellant heptadetonite went off. The bomb sped truly, in both space and time. There was a detonation that jarred the planet to its core, a flare of light many times brighter than the sun at noon, a shock-wave that wrought havoc for miles. But the scout cruiser and her occupants were unharmed. Completely inertialess, invulnerable, the vessel rode effortlessly away. Neal Cloud glanced into his plate; turned his head. “Out,” he said, seemingly unnecessarily. “How’d Lulu work, Joan?” “Better, but not good enough. She was on track all the way, but three point three was the best she could get . . . and I was _sure_ we had it licked this time . . . oh, _damn_!” The voice broke, ending almost in a wail.