"Now wait a minute!" Grampa protested. "That's not fair. Maybe I didn't figure out the theory myself, but I read everything the scientists ever wrote about it. Wanted to know myself what made the blamed thing work. What I told you is what the scientists said, near as I remember. Now me--I'm like Edison. I do it and let everybody else worry over 'why.'" "The only thing you ever did was the polarizer," Joyce snapped. "And then you spent everything you got from it on those fool perpetual-motion machines and those crazy longevity schemes when any moron would know they were impossible." Grampa squinted at her sagely. "That's what they said about the gravity polarizer before I invented it." "But you don't really know why it works," Junior persisted. "Well, no," Grampa admitted. "Actually I was just fiddling around with some coils when one of them took off. Went right through the ceiling, dragging a battery behind it. I guess it's still going. Ought to be out near the Horsehead Nebula by now. Luckily, I remembered how I'd wound it." "Why won't the ship work then, if you know so much?" Joyce demanded ironically. "Well, now," Grampa said in bafflement, "it rightly should, you know." * * * * * "We're stuck," Reba said softly. "We might as well admit it. All we can do is set the transmitter to send out an automatic distress call--" "Which," Joyce interrupted, "might get picked up in a few centuries." "And make the best of what we've got," Reba went on, unheeding. "If we look at it the right way, it's quite a lot. A beautiful, fertile world. Earth gravity. The flivver--even if the polarizer won't work, there's the resynthesizer; it will keep us in food and clothes for years. By then, we should have a good-sized community built up, because out here we won't have to stop with one child. We can have all the babies we want." "You know the law: one child per couple," Joyce reminded her frigidly. "You can condemn yourself to exile from civilization if you wish. Not me." Junior frowned at his wife. "I believe you're actually glad it happened." "I could think of worse things," Reba said. "I like your spunk, Reb," Grampa muttered. "Speaking of children," Junior said, "where's Four?" "Here." Four came through the airlock and trudged across the room, carrying a curious contraption made of tripod legs supporting a small box from which dangled a plumb bob. Behind Four, like a round, raspberry shadow, rolled Fweep. "Fweep?" it queried hopefully. "Not now," said Four. "Where've you been?" Reba asked anxiously. "What've you been doing?" "I've been all over Fweepland," Four said wearily, "trying to locate its center of gravity." "Well?" Fred prompted. "It shifts." "That's impossible," said Junior. "Not for Fweep," Four replied. "What do you mean by that?" Joyce suspiciously asked. "It shifted," Four explained patiently, "because Fweep kept following me." "Fweep?" Junior repeated stupidly.