Thomas hit a snag for a moment. The engineer had answered his challenge. So he'd come up with the answer to the five-ton-per-fifty-pound answer--and had gone further. Thomas knew that there was no apparent limit to the maximum power or lift. It merely set a fifty pound minimum--actually it was 49.87 pounds by measurement--under which limit no amount of tinkering would produce the effect. He smiled. There must be something beyond. After all, small stones moved quietly in natural poltergeist manifestation; they would be able to reproduce that eventually. But for now, the engineer was willing to accept the limitation whereas the physicist would not. He knew now. And he'd leave the sky car until the engineer returned. Let _him_ beef up the control force. It was _his_ baby. Thomas put the panels back on the sky car and stood off to admire it. It was a neat job, just what the public wanted. The urge to get in and drive was a most compelling one, and Thomas succumbed. He sat for a moment, inspecting the dashboard until he had the pattern well set. Then he snapped on the power, took the wheel and pulled back gently. The sky car lifted its nose slightly, and as Thomas pressed the foot pedal, it took off on a side-line straight into the sky. He leveled off at a thousand feet and he did some scurrying back and forth in midair. It did handle a little sloppy but not enough to make the physicist uncomfortable. Yet it wouldn't stand any hedge-hopping or bridge-undercutting without a prayer on the part of the driver. Butter the controls a bit and you could thread a needle with it on the first try. Yes, the engineer had done it again--all of which made Thomas chuckle. A bit more of this and the engineer would have such an income that he'd no longer worry himself into engineering. Then-- Thomas turned the sky car and drove across the city toward Dr. Hamilton's place. He landed on the psychiatrist's lawn and startled the doctor out of a week's growth. "I've won," he told the doctor. "Good," laughed Hamilton. "Mind if I ask which you are today--and how do you know you've won?" "I'm Thomas Lionel, Ph.D. And the engineer has worked himself out of a job." "Interesting. But how?" "He dropped me a mess of cockeyed data, remember? Well, I unraveled it into a most interesting field of science. From it I handed him a slab full of theories and experiments that are just inefficient enough to make him fume. He's come up with several things that make money in vatfuls." "That, I know and understand. Go on." "Remember, I am his ideal personality, I am a physicist, a type of person he has always wanted to be. He couldn't be a physicist because of financial reasons and so he went into the engineering field to bolster up his bank account. That was eminently practical. But now that the worry about the bankroll is over, he can turn to theoretical physics and physical research. That's me--and I've won!"