And that was it. All we had to do was to take these two identical twins--who looked alike, thought alike and cursed alike--and determine which was real and which was bogus. "For a very pertinent reason which you may or may not discover," Gaffa said, "the test must be limited to a few hours. You have until sunrise tomorrow morning, gentlemen." And with that he crutched away at his skip-a-step walk, taking his grinning cohorts with him. The two Haslops remained behind, glowering and grumbling at each other. * * * * * The situation didn't look too bad at first. "There are no two things," Captain Corelli declared, "that are exactly and absolutely identical. And that applies, I should say, especially to identities." It had a heartening sound. I've never been long on logic, being a very ordinary S.E. navigator whose automatic equipment is designed to do practically everything for him, and Corelli seemed to know what he was talking about. Gibbons, being a scientist, saw it differently. "That's not even good sophistry," he said. "The concept of identity between two objects has no meaning whatever, Captain, unless we have a prior identification of one or the other. Aristotle himself couldn't have told an apple from a coconut if he'd never seen or heard of either." "Any fool would know that," one of the Haslops grunted. And the other added in the same tone: "Hey, if you guys are going at it like that, we'll be here forever!" "All right," Corelli said, deflated. "We'll try another tack." He thought for a minute or two. "How about screening them for background detail? The real Haslop was a bounty-claimer, which means that he must have made thousands of planetfalls before crashing here. The bogus one couldn't remember the details of all those worlds as well as the original, no matter how many times he'd been told, could he?" "Won't work," one of the Haslops said disgustedly. "Hell, after twenty-two years I can't remember those places myself, and I was _there_." The other Haslop gave him a dirty look. "You were _here_, fellow--_I_ was _there_." And to the captain he said, "We're getting nowhere, friend. You're underestimating these Balakians--they look and act like screwballs, but they're sharp. In the twenty-two years I've lived with that carbon copy of myself, he's learned everything I know." "He's right," Gibbons put in. He blinked a couple of times and turned pink. "Unless the real Haslop happened to be married, that is. I'm a bachelor myself, but I'd say there are some memories that a married man wouldn't discuss, even when marooned." Captain Corelli stared at him admiringly. "I never gave you enough credit, Gibbons," he said. "You're right! How about--" "Don't help any," one of the Haslops said morosely. "I never was married. And now I never will be if I've got to depend on you jerks to get me out of this mess."