against the common weal—"

"And you are! You're like a man who stands on a river bank and has a lifebelt and won't throw it to a man drowning in the river."

Lang sighed. "I won't deny we're working on longevity," he answered. "Obviously we are. The problem interests biologists throughout the Solar System. But we aren't publicizing our findings as yet for a very good reason. You know how people jump to conclusions. Can you imagine the hysteria that would arise in this already unstable culture if there seemed to be even a prospect of immortality? You yourself are a prime case ... on the most tenuous basis of rumor and hypothesis, you've decided that we have found a vaccine against old age and are hoarding it. You come bursting in here in the middle of the night, demanding to be made immortal immediately if not sooner. And you're comparatively civilized ... there are enough lunatics who'd come here with guns and start shooting up the place."

Radek smiled bleakly. "Of course. I know that. And you ought to know the outfit I work for is reputable. If you have a good lead on the problem, but haven't solved it yet, you can trust us not to make that fact public."

"All right." Lang mustered an answering smile, oddly warm and charming. "I don't mind telling you, then, that we do have some promising preliminary results—but, and this is the catch, we estimate it will take at least a century to get anywhere. Biochemistry is an inconceivably complex subject."

"What sort of results are they?"

"It's highly technical. Has to do with enzymes. You may know that enzymes are the major device through which the genes govern the organism all through life. At a certain point, for instance, the genes order the body to go through the changes involved in puberty. At another point, they order that gradual breakdown we know as aging."

"In other words," said Radek slowly, "the body has a built-in suicide mechanism?"

"Well ... if you want to put it that way—"

"I don't believe a word of it. It makes a lot more sense to imagine that there's something which causes the breakdown—a virus, maybe—and the body fights it off as long as possible but at last it gets the upper hand. The whole key to evolution is the need to survive. I can't see life evolving its own anti-survival factor."

"But nature doesn't care about 

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