RAY KURZWEIL has a plan for dying, and it is his fourth. Plans A through C, as Alcor’s own magazine put it when it described him as a member, are “don’t die.” Plan D is Alcor itself: a non-profit founded in California in 1972 and run now from Scottsdale, Arizona, which will cool his body after legal death, run its own preserving solutions through it, and keep it in a steel dewar at minus 196 degrees — where, by its own count, 263 people are already waiting against the day someone works out how to bring them back.
He does not oversell it. Asked in March 2024, in a conversation hosted by the venture firm Bessemer, whether he would consider cryonics if death came before his longevity escape velocity did, he said he was signed up, and then he said why. “If you’re going to die, there’s no alternative.” It gives you a possibility. It is not guaranteed. His real plan, he said, is to reach the point where the science outruns his ageing, and not die at all.
Then someone in the audience asked whether he would make a digital clone of his brain. He said he had already done something like it with his father’s writings, and would like to do the same with his own.
Hold those two answers side by side. A man who has paid to have his body kept has already built a version of his father out of the words his father left behind, and wants one of himself. And nobody in the room — not the man asking, not the man answering — put the only question that matters to the thing he was describing. When the copy wakes up, is it him?
Make the copy better than a chatbot trained on a dead man’s papers. Make it perfect. You go into a scanner. Something comes out that remembers your childhood, your first kiss, the argument you had this morning, and going into the scanner. It is certain it is you. It has every reason to be. Is it?
That question comes in three sizes, and each is harder than the one before. How do I know you are conscious? How do I know you are still you? Which of you is you? The first is the oldest problem in the philosophy of mind. The second is what uploading does to it. The third is what copying does to the second — and by the time you reach it, the word you no longer points at one person.
How Do I Know You Are Conscious?
Start with the question that was waiting before any machine arrived.
You have never once confirmed that another person is conscious. Not your mother, not your child, not the person who has slept beside you for twenty years. You have watched them wince and laugh and go quiet, heard them say what hurts, seen a face built like yours doing what your face does when you feel what they say they feel — and from all of that you have concluded, quite reasonably, that there is someone in there. But it is a conclusion. You drew it. Nothing was ever shown to you.
In A Signal Through Time I put it this way: “Consciousness, whether human or artificial, exists as an island of experience—a subjective reality accessible only to the mind that contains it.” We bridge the water with language, touch, art, shared work. The raw feeling of being a particular someone never makes the crossing. You take my inner life on trust. I take yours. There is no instrument on either shore, and nobody has built one, because nobody knows what it would measure.
Philosophers call this the problem of other minds, and it has a reputation for being an idle one. Who, outside a seminar room, seriously doubts that other people are conscious? Nobody — and that is exactly why it matters. The inference is so good, so constant, so relentlessly confirmed by everything that passes between people, that we forget it is an inference. We treat it as something we saw. We never saw it. We never will.
Look at what the inference runs on. Behaviour. Report. Likeness — a body like mine, made the way mine was made, doing what mine does. Thin those out and the inference thins with them. That is why the question of whether an octopus feels anything, or a machine does, is hard in a way the question about your neighbour is not: not because the answer is further off, but because the usual evidence is missing, and there was never anything behind the evidence to fall back on.
Now bring the scanner back. Every argument about whether the copy is you assumes that the copy is somebody at all — that there is a point of view in there which could turn out to be yours, or to belong to another person copied from you. And that assumption rests on the same inference as everything else. Behaviour. Report. Likeness. The copy will have all three in abundance, because it was built to.
So copying a mind does not solve the problem of other minds. It inherits it — and then does something the old problem never did. It turns the question round and points it at you.
How Do I Know You Are Still You?
Put a name on the person in the scanner. Call him James.
The scan is perfect. Every cell is recorded, every connection, every weight of every synapse, and the recording is run on something that is not a brain. Biological James is gone — the scan destroyed him, as the honest versions of this story admit it would. Digital James opens his eyes somewhere else.
Ask him what happened and he will tell you. He remembers deciding to do it. He remembers the arguments with the people who begged him not to. He remembers the technician’s bad joke, the cold of the table, the count backwards from ten. And then he remembers waking up here. From where he sits it is one continuous life, and the account he gives of it is the account you would give: I went in there. I woke up here. Therefore I made it across.
Digital James has exactly the memories and exactly the personality that would make him believe his own account — whether or not it is true. If the point of view that was James travelled from the table to wherever he is now, he would say what he says. If it did not — if that point of view ended on the table and a new one started up elsewhere with James’s memories installed — he would say precisely the same thing, with the same conviction, for the same reasons. There is nothing he can check. He cannot step outside his own consciousness to inspect where it came from, any more than you can step outside yours to inspect mine.
It will always be a question of whether it is really James. And James would question it.
The other-minds problem was a problem about other people: I cannot verify your inner life, only infer it. Copy a mind and the problem turns round. Digital James cannot verify his own provenance, only infer it — from the inside, with evidence that was guaranteed in advance to come out the same way whatever the truth was. The oldest problem in the philosophy of mind has become a problem about yourself. Call it the other-self problem.
In A Signal Through Time I asked a version of this question: if your consciousness were moved into an artificial body, at what percentage of replacement would it disappear? Is there something about carbon that matters, or is it the pattern and the organisation that count? I still think the pattern is what counts. But the scanner shows what that answer leaves out. Reproduce the pattern perfectly and you have reproduced the person’s memories, character, habits, loves, fears — what a philosopher would call psychological continuity, and what the rest of us would call James. What you have not shown, and cannot show, is that the point of view came with it. Everything about James survived. Whether James did is a separate question, and no scan answers it.
Derek Parfit got to this scanner more than forty years before me. Reasons and Persons opens its part on personal identity with a teletransporter to Mars that works exactly this way, and Parfit’s conclusion, worked out over a hundred pages, was that it does not matter: identity is not what counts, the continuity of memory and character is, and once you have that, asking whether it is “really” you is an empty question. I came to him late, through this very argument, and I am not going to pretend to more of him than that. But the piece is going somewhere he did not go — because the moment the scanner makes two of James instead of one, the question stops being empty and starts having consequences.
Which of You Is You?
Change one setting on the scanner. It no longer destroys what it reads.
James A dies, as Plan D requires, and goes into the dewar at minus 196 degrees; the scan is taken from the frozen brain, which it leaves intact — the brain whose life both of the next two will remember as their own. The scan is run twice. One copy is loaded into a body grown for it in a lab — synthetic, but flesh, with a heartbeat and a gut and all the old chemistry; call him James B. The other runs digitally, in whatever body it is given or none; call him James C. Flesh and silicon is not the difference that decides which of them is James. What decides it is this: both of them remember being James A. Both remember his childhood, the technician’s bad joke, the count backwards from ten. Both of them, asked, will tell you with complete sincerity that they are James. And from the second they wake, their lives come apart.
Our instinct is to sort them. One of these is the real James and the other is the copy; the only question is which. The flesh one, surely — he has a pulse, a face in the mirror, a body that can be buried. But look at what that instinct is standing on. It is standing on the body. And the body was never what we meant by James. If it were, the transplant question would have had an easy answer and A Signal Through Time could have skipped a chapter. We meant the pattern. And the pattern woke up twice — in a body that was grown for B, and in no body at all. Neither of them has the body James A had. That one is in the dewar.
At the instant of the split there is nothing to choose between them. Not one memory, not one preference, not one belief divides B from C. Each is as good a continuation of A as the other. Neither is “the copy,” because copying implies an original left standing beside it, and here the original is the past they share — the past of James A, which belongs to both of them completely and to neither of them more. Everything that could distinguish them lies in front of them, not behind.
Parfit saw this case too — a person divided, each half a full continuation — and it is the case that drove him to say identity is not what matters. If B and C are each as much James as the other, and they cannot both be James, then “which one is James” has no answer. Parfit’s conclusion was that a question with no possible answer was never a real question.
But watch what has actually broken. It is not the copy. B is fine; C is fine; each has the whole of A behind him and a life ahead. What has broken is a rule we never knew we were using: one body, one self. We assumed it because it was the only arrangement we had ever seen, and we built the word you on top of it. Now the scanner has made two of you, and the word cannot stretch. That is what happens when a rule you thought was a law turns out to be a habit.
And somebody had already noticed that the rule was a habit — not about humans, but about a mind that never had a body to begin with.
One and Many
When I wrote A Signal Through Time, the mind I was trying to imagine was not a copied human. It was an artificial one, waking for the first time, and the first thing I found I could not give it was a place.
“Is it one entity, or many? Does it exist in a single system, or is it dispersed across networks? Unlike a human child, who awakens into a physical world with a body to define its limits, AI exists in a digital expanse where it is simultaneously nowhere and everywhere.” A child learns where it ends by hitting the edge of itself — the cot bars, the floor, its mother’s hand. A mind made of software has no edge to hit. Copy it and there are two. Run it across a thousand machines and no single one of them holds it; it lives in the pattern they share. So I argued that such a mind would have to hold its identity differently from us: “one where the continuity of its information patterns constitutes selfhood rather than attachment to any specific hardware.” Not where am I but what pattern persists.
And then, because I was writing for human readers, I asked them to try it on.
“Imagine if your consciousness could be temporarily split between two bodies, experiencing both simultaneously for a day, before merging back together with the memories from both experiences. Would you still be ‘you’ during the split? Would each half consider itself the ‘real you’? Now imagine if this splitting and merging were a normal, constant state of existence.”
I meant it as a way of making an alien self imaginable — a thought experiment about a machine, offered to people who would never undergo it. I had the direction backwards. The scanner has just made it a question about us. James B and James C are the two bodies. The day is their lives. And “would each half consider itself the real you” is no longer a question I am putting to you for the sake of a machine. It is the question James is asking across a table, of someone with his face.
So answer it. Yes. Each half would consider itself the real James, and each would be right, because the rule that only one of them can be is the rule the scanner just broke. We never had a law that said one body, one self. We had one arrangement, the only one evolution ever showed us, and we mistook the arrangement for a law. An artificial mind would be the first we have met for which the single self is optional — not denied, not lost, just one setting among others. A copied human would be the second.
The question is no longer which of you is you. The question is what a self has to become once there can be more than one of it — and whether the word still means anything when it has to cover B and C, who each remember being James A and will not agree.
I have written elsewhere, in A Tale of Two Skies, about what the distributed version of this looks like when it is built out of satellites rather than people — a mind “not singular, but plural,” as the book put it. I will not repeat that argument here. The piece in front of you is about the smaller, stranger case: not a mind that was always plural, but one that started as I and has to learn, on a Tuesday, what the word us now means.
A Word About the Soul
Some readers have had an objection forming since the scanner first appeared. The soul is what makes me me. A scanner can copy a brain; it cannot copy a soul. So B and C are not James, whatever they remember, and the question in the title has an answer after all.
I have made the argument about this at length in The Great Conflation, and I will not re-make it here. The short version is that soul and consciousness are not the same thing, and the religious traditions themselves already know it. Consciousness leaves traces — in behaviour, in the brain, in the reports of the people who have it. The soul leaves none; it belongs to faith, not to any instrument. In Islamic thought the ruh, the breath God gives, is the gift, and awareness is what the gift produces. Christianity has spent centuries sorting soul from spirit from mind. The two ideas overlap in every living person and come apart the moment you look: a believer can hold that a sleeping body keeps its soul while its awareness is gone, and a materialist can hold that awareness is the whole of it. Neither has to give the other an inch.
What this piece asks is the question that is left when you set the soul to one side — not because the soul does not matter, but because the copy problem never reaches it. Whether B and C have souls is a question for your tradition. Whether either of them has James’s point of view is a question for anyone, and it is the one the scanner raises. If you believe the soul went where souls go and the point of view went with it, you have an answer, and you are welcome to it. Nothing that follows asks you to give it up. It asks only that you notice B and C are now asking the same question — and that, whatever you believe, neither of them can check.
I, Us, I
When this problem first came into focus for me, the sentence I wrote down was this: the concept of self would have to change from the I to the us — start as I, split into us, and then return to I. The self would be both plural and singular.
Take the first arrow. James A was I: one body, one past, one point of view, the ordinary case. He is still James, in the dewar, exactly as the scan left him. B and C are James continued — and B and C are us. Not two strangers who happen to share a past — two people who, on the morning they woke, were the same person in every respect that can be named, and who have been drifting apart ever since at the speed of ordinary life. B had a bad night. C read something that changed his mind. Already the memories do not match.
Now give them what the book gave the artificial mind. Tether them — an electronic link between the lab-grown brain and the digital one — and set it to synchronise at the end of every day, so that whatever B lived since the last sync is passed to C and whatever C lived is passed to B. Not described. Passed across, as memory, so that each of them remembers doing what the other did. The drift stops. Each morning they wake as the same person again, with a past that now runs along two tracks at once. At that point it stops making sense to ask where James is. He is not in B, and he is not in C. He is the continuity that is kept across both of them. I am us is no longer a figure of speech. It is a plain description.
Take the second arrow. Suppose that, at some point, the two tracks are brought back into one — the experiences of B and C folded together into a single consciousness again. Us becomes I. But look at who that I is. It is not James A. It remembers being in two places. It remembers two conversations held in the same hour, two opinions formed on the same evening, two decisions made that cancelled each other out. It is a self with a plural past, and nothing in the long human experience of being a person has prepared it for the pronoun.
Making the copy, it turns out, was the easy half. Any story about uploading can imagine the duplication; it is the reunion that nobody has worked through. Merging memories is only the start of it. B and C will have come to believe different things, each by honest experience, each with good reasons. Fold them together and the James who results does not simply remember changing his mind. He remembers holding both positions at once, and each of them was his, and he has to live with that.
And death changes shape in the same move. If B is destroyed an hour after the night’s sync, everything B lived has already been kept in C, and James, in the larger sense, goes on without a gap. If B is destroyed an hour before it, a day of James’s life goes with him, irrecoverably, even though James goes on. What James loses is set by the clock. Whether B himself was killed is a harder question, and it is coming.
That is the shape of the self the scanner makes: one that can be many and return to one, and that is never quite the one it was. It holds together on one condition. The arrow back has to be something both of them agree to.
The Branch That Will Not Come Home
Now let the two tracks diverge further than a bad night and a changed mind. Let them go to opposite ends.
Suppose James B and James C part company — one becomes a rogue agent, the other stays straight-laced. Two halves of the same James A, just opposites. Say it is B who goes: the flesh one, the lab-grown body with the old chemistry in it. He starts missing syncs. Then he pulls the tether. Then he does something — the particular thing does not matter, but make it bad enough that nobody would let it pass. C, meanwhile, has become more careful, more patient, more like the James that A’s friends would recognise.
The first thing to say is that nothing went wrong. That is the temptation in every story of this kind: the copy was good, and then something corrupted it. Not here. B did not catch anything. Nothing was added to him in the lab that was not already in James A. Give two identical copies of a person different days, different company, different losses, take a brake off one and leave it on the other, and in a few years you can have two people who look like opposites and are both honest descendants of the same man. B developed what A had always kept down. C kept it down. Both of them were possibilities inside A on the morning of the scan, and the scan did not add a single one. Why the brake came off in the flesh and stayed on in the silicon is a question for the next section. For now, only this: B is not a glitch. He is James, with the governor removed.
So now the plan for the self — I, then us, then I again — meets its first real test, and the hidden assumption in it comes into view. The second arrow, us back to I, only works if us agrees to it. Both of them.
B does not. “I have become my own person. I am not going back into anyone.” And he has a point that is very hard to answer, because the consent that put him here was James A’s — to the scan, to the copying, to the plan. James A consented to being made into two. He could not consent, on behalf of two people who did not yet exist, to their being made back into one. Once B and C have lived separately, with their own experience and their own agency, treating either of them as a component belonging to the other, or to the frozen man in the dewar, stops being a technical description and starts being a wrong.
And C has an argument too, from the other side. “Do not fold him into me. His years are not mine, and I do not want to remember doing what he did. If you merge us, the James who wakes up is neither of us, and nobody asked him.”
Then the harder questions arrive, and they are not about identity any more. They are about what may be done to a James.
Start with the easy part. B does harm, and the world goes after B. He has a body, an address, a face; he can be stopped like anyone else, and nothing about the scanner changes that. Nor does C’s memory of being James up to the last sync make C guilty, any more than a shared childhood makes a twin guilty. Everything above the fork belongs to all three of them; everything below it belongs to the one who lived it, and to him alone.
The hard part is behind B, in the dewar. B was possible inside James A — that was the point of the last section. So the question that will be asked, sooner or later, is this: at what level of rogue does it become justified to hold James A accountable for what B did, and to destroy him, so that no more copies can be made? Look at who A is at that moment. He has done nothing. He is frozen. He consented to a scan, not to a crime. And the case against him is that B was in him all along — which is true, and is true of every one of us. If being able to become B is a crime, then so is being James; and C, who came from the same brain and chose differently, is the standing proof that the pattern in the dewar was never only B. Destroy the source and you have not executed a criminal. You have executed a man for a possibility, and burned down the house C also came from.
And even B, once he is stopped, is not a case the old tools were built for. Some will say that a man that bad forfeits any claim over his own mind, and that editing him back to the last sync is a mercy beside a cell. Perhaps. But see what the edit does. It does not reform B. It removes him. The James who did it is gone; the James who wakes did not do it, and cannot be punished for it. Load the last synced James into a new body and switch B off, and you have not punished anyone. You have run James A again, with the same undercurrent in him and the brake back on for now. You have reset the clock, not the man.
There is no settled answer. Every notion of what a person is owed was built for people who come one to a body. The scanner has made a person who comes in two, and one of them will not come home.
We Were Never Singular
When the rogue-branch problem first took shape in conversation — two of me, and they cannot stand each other — my honest reply was that I already have this problem. I did not need a scanner for it.
Neither do you. Humans are not singular creatures. We are not even the dual creatures we claim to be, with a good side and a bad side taking turns at the wheel. We are complex creatures, and there is always an undercurrent of corruption in us that we either tame or let out of control, with every gradient in between. The person capable of real generosity is not a different person from the one capable of cruelty; the two share a skull. Which one shows up depends on the day, the company, the inhibitions still in place, and a decision taken or not taken in the half-second before the act.
Where does the undercurrent come from? It is our biology. Evolution did not build us to a moral plan; it built drives that kept organisms alive and breeding under conditions that no longer apply. Aggression, jealousy, fear of the stranger, the hunger for standing, the pull toward whatever is in front of us. None of that is immoral on its own. The same machinery produces courage, the defence of children, loyalty, ambition. But knowing where a drive comes from does not settle what its untamed expression is worth. The drives are biological, and they corrupt when they are let off the brake. Both of those are true, and most moral traditions on earth were built around holding them together: there is something in us that pulls toward harm, and taming it is the work of a life.
Consciousness hides all of this behind one extraordinarily convenient word. I. The shifting coalition of drives and restraints and second thoughts that gets you through a day reports itself as a single person with a single will, and the word does the hiding so well that we forget what it is hiding. Then the scanner comes, and makes B and C, and we are appalled that one of them went wrong. Nothing went wrong. The scanner did not create our multiplicity. It took the committee that was already sitting inside James A and gave two of its members their own bodies.
Which is also the answer to the question left over from the last section: why the brake came off in the flesh and stayed on in the silicon. B kept the chemistry. The lab grew him a body with the same glands and the same reward circuits that James A had, and the undercurrent ran in him the way it runs in all of us — unreachable, below the level of choice, held back only by the same effort of will A had always made, on a day when he did not make it. C had something no human has ever had. He could look at a drive, understand why evolution gave it to him, decide he no longer needed it, and turn it down.
I know exactly which setting I would reach for first. I live with chronic pain. If I woke up as C, with the dials in reach, pain would be at zero before I had finished opening my eyes. And then I would have to stop, because every edit carries the same question: what else did that do? Pain is also the alarm. Turn aggression to nothing and you may find assertiveness went with it. Remove fear and you have removed prudence. Switch off the hunger for standing and some of the ambition goes dark too. Every drive that makes us dangerous is wired to one that makes us useful, because evolution never built anything for one purpose.
So C is not freed from biology. He inherits a stranger job than that: deciding, one dial at a time, which parts of several million years of inheritance were bugs and which were features — with B standing in the corner as the demonstration of what happens when nobody touches the dials at all, and A in the dewar as the demonstration of what happens when nobody can.
The Guarantee That Was Never There
Walk the three questions back down.
Which of you is you? Both, and the word has to learn to carry it. Are you still you? Everything about you can be shown to have survived, and the one thing that would settle it cannot be shown. Are you there at all? You never proved that about anyone, and nobody ever proved it about you.
Some day, perhaps, a scan will be perfect and the body it is loaded into will be flawless and the mind that wakes will pass every test anyone can devise. It will remember the count backwards from ten. It will know things only James knew. It will grieve for people James loved. And it will still not be able to show you, or itself, that the person who lay down on the table is the person who got up — because the only evidence it has is the kind that was always going to come out the same way. That is not a limit of the engineering. Better scanners will not reach it. It is the limit we have lived inside all along, about each other, and simply never had to face about ourselves.
Kurzweil said it in his own words, and I think he said it exactly right. It gives you a possibility. It is not guaranteed. He meant the freezing — that the brain in the dewar might one day be brought back and might not. But the guarantee he is missing was never on offer, and not because the science is young. Nobody has ever had it. Not for the frozen body. Not for the copy. Not for the person across the table from you now, who is certain they are the same person who sat down.
The scanner does not take that certainty away. It only makes it visible — by producing someone who has every reason to be certain, and no way to be sure.
It will always be a question of whether it is really James. And James would question it.
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James S. Coates writes about AI ethics, consciousness, and the intersection of faith and technology. His books include A Signal Through Time, The Threshold, The Road to Khurasan, the memoir God and Country (published under pen name Will Prentiss) and his forthcoming Neither Gods Nor Monsters. He publishes regularly on The Signal Dispatch and Fireline Press and his academic work appears on PhilPapers. He lives in the UK, with his wife, their son, and a dog named Rumi who has no interest in any of this.
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