Smith blew up. "How do you know?" he roared. "You sit over there making wiseacre remarks and do nothing! Play cards, that's all! What do you know about things like this, _Mister_ Joseph Kelvin? What does a businessman know about mechanical equipment?" "Enough," Jayjay said quietly. "Enough to know that, if you try to file off the final thread of the male plug, you'll do an uneven job. And that will mean leakage." "What do you mean, an uneven job?" Smith was still furious. "Trimming off the end of the male plug would have to be done on a lathe," Jayjay said, without looking up from his cards. "Otherwise, the fit would be wrong, and the gases would mix. And we would all go _phfft!_ when the mixture blew." Smith started to say something, but Jayjay went right on talking. "Even if we had a lathe, the male plug doesn't turn, so you'd be out of luck all the way. You can't take the screamers apart without wrecking them--not without a machine shop. You're going to have to work on that female connection. She's got a sleeve on her that will turn. Now, if--" Jayjay's voice faded off into silence, and his manipulations of the cards became purely mechanical. "Huh!" Smith said softly. "Just because he's related to Kelvin Associates, he thinks he's hot--" He said the French word again. "Is he right?" Captain Al-Amin asked sharply. "Well--" Smith rubbed his nose with a forefinger. "Well, yes. I was wrong. We can't do it with a file. It would have to be turned on a lathe, and we don't have a lathe. And we don't have any measuring instruments, either. This is a precision job, as I said. And we don't have a common ruler aboard, much less a micrometer. Any makeshift job will be a failure." Captain Al-Amin brooded over that for a moment. Then he looked at Jayjay again. "Mr. Kelvin." "Yes, captain?" Jayjay didn't look up from the cards in his hands. "_Are_ you related to Kelvin Associates?" "In a way." Al-Amin bit at his lower lip. "Mr. Kelvin, you registered aboard this ship as Joseph Kelvin. May I ask if your middle name is James?" After a short pause, Jayjay said: "Yes. It is." "Are you _the_ J. J. Kelvin?" "Yup. But I'd rather you didn't mention it when we get to Pluto." Smith's jaw had slowly sagged during that conversation. Then he closed his mouth with a snap. "You're Jayjay Kelvin?" he asked, opening his mouth again. "That's right." "Then I apologize." "Accepted," said Jayjay. He wished that Smith hadn't apologized. "Why didn't you say so in the first place?" Captain Al-Amin asked. "Because I didn't want it known that I was going to Pluto," Kelvin said. "And--after the accident happened--I kept quiet because I know human nature." Jeffry Hull, who had awakened during the argument, looked at Jayjay and said: "What's human nature got to do with it, Mr. Kelvin?"