'I know nothing about that. What new policy are you referring to?'
Paul's eyebrows lifted. 'You haven't heard? Really? -Well, Andrew, what they have done is to begin manufacturing central control stations for their robots-giant positronic computers, actually, which are able to communicate with anywhere from a dozen to a thousand robots by microwave transmission. The robots they're turning out now have no brains at all.'
'No brains? But how do they-'
'The gigantic central brains do all the data-processing for them. The robot units themselves are nothing more than mobile limbs of the main thinking center.'
'Is that more efficient?'
'U. S. Robots insists that it is. Whether it really is, I can't say. But it's my notion that the whole thing is mainly a long-range way of getting back at you. Smythe-Robertson authorized the turn toward the new direction just before he died, you see. He was old and ill, but he pushed his program through and made it stick. And I suspect that what he wanted was to make certain that the company would never again be confronted by a robot able to give them all the trouble that you have. So they've begun to separate brain and body. A mindless mechanical laboring unit can't be deemed worthy of civil rights or legislative protection; and a big brain that sits in a box is just a computer. The brain isn't going to be able to turn up in the office of the Chairman of the Board one day and demand to be put into a fancy new body. And the robot bodies, since they're completely brainless, aren't in a position to conceive any demands at all.'
'It seems like a long step backward,' Andrew said. 'They've undone two hundred years of progress in robotics merely to spare themselves some small degree of political trouble.'
'Indeed. Indeed.' Paul smiled and slowly shook his head. 'It's astonishing, Andrew, the influence you have had on the history of robotics. It was your artistry that encouraged U. S. Robots to make more robots more precise and specialized, because you seemed too clever by half, and they were afraid that that would frighten people. It was your winning your freedom that resulted in the establishment of the principle of robot rights. And it was your insistence on having an android body that made U. S. Robots switch over to this brain-body separation.'
Andrew said, 'I suppose in the end what the corporation will have created is a world that has just one vast brain controlling several billion robot bodies. All the eggs will be in one basket, then. Dangerous. Not in any way sensible.'
'I think you're right,' said Paul. 'But I don't suspect it will come to pass for a century, at least. Which means I won't be here to see it.'
He had crossed the room, and stood by the open doorway, looking out into the wooded grove just beyond. A mild moist spring breeze was blowing from the ocean, and Paul inhaled deeply as though trying to drink it in. After a moment he turned to face Andrew, and he seemed suddenly to have grown ten years older in just the time that he had been here.
'In fact,' Paul said in a voice that was no more than a husk of itself, 'I may not live to see next year.'
'Paul!'
'Don't sound so surprised. We're mortal, Andrew,' Paul said, with a shrug. 'We're not like you, and by this time you ought to understand what that means.'
'I do. But-'
'Yes. Yes, I know. I'm sorry, Andrew. I know how devoted you've been to our family, and what a sad and dreary thing it must be for you constantly to see us growing up and getting older and older and eventually dying. Well, we don't like it much either, I have to tell you, but there's no sense railing against it. We live twice as long as human beings usually did just a few hundred years ago. That's long enough for most of us, I suppose. We simply have to be philosophical about it.'
'But I don't understand. How can you be so calm in the face of-of complete termination? Of the total end of all your striving, all your desire to achieve and learn and grow?'
'I wouldn't be, I suppose, if I were twenty years old right now, or even forty. But I'm not. And part of the system, Andrew-the good part, I guess-is that when you reach a certain age it generally stops mattering to you so much that you're inevitably going to die soon. You aren't really achieving and learning and growing any more. For better or for worse, you've lived your life and done whatever you can for the world and for yourself, and now your time is up and your body knows that and accepts it. We get very tired, Andrew. You don't know what that word means, not really, do you? No. No, I see that you don't. You can't. You aren't able to get tired and so you have only a theoretical knowledge of what it's like. But it's different for us. We slog on and on for seventy or eighty or maybe a hundred years and eventually it all just becomes too much, and so we sit down and then we lie down and finally we close our eyes and don't open them again, and right at the end we know that it is the end and we simply don't mind. Or don't care: I'm not sure that's the same thing, really, but perhaps it is. -Don't look at me that way, Andrew.'
'Dying is a natural thing for humans,' Andrew said. 'I do understand that, Paul.'
'No. You don't. You really don't. It just isn't possible for you to understand. You secretly think that death is some sort of lamentable design flaw in us and you can't understand why it hasn't been fixed, because it ought to be pretty simple to keep on replacing our parts indefinitely as they wear out and break down, the way yours have always been replaced. You've even had an entire body replaced.'
'But surely it would be theoretically possible for you to be transferred into-'
'No. It isn't. Not even in theory. We don't have positronic brains and ours aren't transferable, so we can't simply ask someone to scoop us out of a body that we're finished with and put us into a nice shiny new one. You can't comprehend the fact that humans inevitably have to reach a point where they're incapable of being repaired any more. But that's all right. Why should anyone expect you to be able to conceive the inconceivable? I'm going to die soon and that's all there is to it. And I want to reassure you at least in one respect, Andrew: you'll be well provided for financially when I go.'
'But I am already quite well provi-'
'Yes. I know that. All the same, things can change very quickly, sometimes. We think we live in a very secure world, but other civilizations have felt just as smug and they had reason sooner or later to see that they were wrong. Anyway, Andrew: I'm the last of the Charneys. I have no heirs except you. There are collateral relatives descended from my great-aunt, but they don't count. I don't know them and I don't care about them. I care about you. The money I control personally will be left in trust in your name and you'll continue to be economically secure as far into the future as anyone can foresee.'
'This is unnecessary, Paul,' Andrew said, with difficulty. He had to admit to himself that what Paul had said about his not understanding death, not being able to understand it, was true. In all this time he had not really managed to get used to the deaths of the Charneys.
Paul said, 'Let's not argue, all right? I can't take the money with me and there isn't anything I'd rather do with it than leave it to you, so that's the way it's going to be. And I don't want to consume any more of my remaining life-span discussing the matter with you. Let's talk about something else. -What are you working on these days?'
'Biology, still.'
'What aspect in particular?'
'Metabolism.'
'Robot metabolism, you mean? There isn't any such thing, is there? Or is there? Do you mean android metabolism? Human metabolism?'
'All three,' Andrew said. ' A synthesis of sorts.' He paused, and then he went plunging ahead. Why hold anything back from Paul? 'I've been designing a system that would allow androids-I mean myself; I am still the only functioning android, am I not?-to draw energy from the combustion of hydrocarbons rather than from atomic cells.'
Paul gave him a long, slow look.
'You mean,' he said finally, 'that you want to make it possible for an android to be able to breathe and eat the same way humans do?'
'Yes.'
'You've never mentioned any such project as this to me before, Andrew. Is it something new?'
'Not really. In truth, Paul, it is the reason I began all this biological research in the first place.'
Paul nodded abstractedly. It was as though he was listening from a very great distance. He seemed to be
