Deep Thought takes 7.5 million years. It delivers a number. It understands nothing.

That gap — between a correct output and actual comprehension — is the central problem Adams planted inside a comic novel in 1979. He called it the 42 problem. Philosophers call it the hard problem of meaning. AI researchers are now living inside it.

John Searle published his Chinese Room thought experiment in 1980. A person sits in a room, following rules for manipulating Chinese symbols. They produce correct outputs. They understand no Chinese. The system processes. It does not grasp.

Adams got there first. Through fiction. As a punchline.

He chose 42 precisely because it was unremarkable. Not 1. Not infinity. Not some cosmically resonant prime. A number you might find on a bus. Any answer looks arbitrary when the question is wrong. That was the point. The wrongness of the answer reveals the wrongness of the project — the assumption that meaning is something a large enough machine can eventually produce.

Search engines rank certainty. Recommendation algorithms generate confidence. Language models produce fluent, well-structured responses to questions no one has properly formulated. The architecture of the modern information economy is, in its deep structure, a very large Deep Thought.

Adams was laughing at that architecture in 1978. The laughter has not aged.

What makes the 42 problem durable is that it does not require a supercomputer to sting. It applies everywhere meaning is assumed to follow from data. Economics produces precise models of irrational behaviour. Psychology quantifies happiness. Neuroscience maps the correlates of consciousness. The measurements are real. The comprehension is not guaranteed.

Adams did not argue that data was useless. He argued that computation is not the same thing as understanding. That is not a mystical claim. It is an epistemological one — and it is currently the most contested question in cognitive science.

The question is not rhetorical. It changes how you read everything he produced.

The standard account is affectionate: Adams was a brilliant comic writer with a scientific mind and a gift for absurdism. He made people laugh. He asked big questions. He died too young. End of biography.

That account misses something. The jokes in the Hitchhiker's series are not decorations on top of ideas. The ideas are inside the jokes, structurally. Remove the comedy and the argument collapses. The form is the argument.

Consider the total perspective vortex — a machine that shows you your true size relative to the entire universe, which kills most beings instantly from existential horror. Adams's comic solution: the only person who survives is Zaphod Beeblebrox, because the vortex is running inside a simulated universe created for him. In that universe, he actually is the most important thing. The joke works because the terror is real. The terror works because the joke is real. Neither operates without the other.

Or consider Marvin the Paranoid Android — not paranoid, technically. Depressed. A robot with a brain the size of a planet, tasked with opening doors. The comedy is his complaint. The philosophy is what the complaint implies: intelligence without purpose is not just wasted. It suffers. Consciousness without adequate problems is its own kind of torment. Adams wrote that in 1978. The question of what conscious AI systems might experience is no longer hypothetical.

Adams published five Hitchhiker's novels, two Dirk Gently novels, and a non-fiction work that might be his most serious piece of writing. He wrote for Doctor Who. He struggled publicly and visibly with procrastination. He described himself as the world's greatest expert at starting novels and one of its worst at finishing them. He missed every deadline. His editors at one point locked him in a hotel room.

The fragments from his unfinished Dirk Gently novel, assembled posthumously as The Salmon of Doubt in 2002, show what he was moving toward: harder material, stranger structures, less willing to let comedy soften the edges. He was not finished thinking. He died at 49 with the thinking incomplete.

Adams called himself a radical atheist. Not agnostic. Not quietly secular. Not a vague non-practitioner. Radical. He chose the word deliberately.

The distinction mattered to him. Agnosticism, he argued, implies the question is still open — that we simply lack sufficient evidence to decide. Adams thought the honest position was stronger than that. Not "I don't know." More like: "The cognitive machinery that produces religious belief is understandable and interesting, and the conclusions it reaches are not well supported."

He was curious about that machinery. Why do humans believe things that cannot be demonstrated? What psychological and evolutionary architecture generates religious experience? These were not rhetorical questions designed to produce contempt. He found the questions genuinely absorbing.

That is what made his atheism unusual. It was not combative in the way that makes people defensive. He was not performing superiority. He was interested — in consciousness, in cognition, in the mechanisms by which minds construct meaning from ambiguous data.

And he was, by most accounts including his own, more genuinely moved by the universe than most believers claim to be. He wept the first time he used a Macintosh. He found mathematics beautiful. He loved Darwin with an intensity that approached devotion.

Richard Dawkins, who is not given to casual emotional display, described Adams's death as a loss that hit him like a family bereavement. Their recorded conversation — Adams discussing atheism, evolution, and wonder — has circulated as a kind of document in the science-and-meaning tradition ever since.

Adams's position, stripped down, was something like this: the universe is vast, indifferent, and astonishing. Pretending it is smaller or more personally interested in you does not make it more bearable. It makes it less. The honest response to existence is wonder, not belief. Wonder does not require a deity. It does not require consolation. It is simply the accurate reaction to what is actually there.

Whether that makes wonder a replacement for the sacred, or whether it is the sacred — cleared of its institutional furniture — is a question Adams left open. Deliberately.

Most science fiction, even when it reaches for the dark, keeps humanity at the centre. The universe threatens us. It tests us. It wants something from us. Our survival, our struggle, our victory or defeat — these register.

Adams broke from that. The universe in his books is not hostile. It is indifferent. It is not organised around human significance. It does not notice us particularly.

That was a deliberate structural choice. The indifferent universe is not nihilism in his hands. It is the precondition for a different kind of meaning. Against radical indifference, small moments of warmth become extraordinary rather than sentimental. Two people being kind to each other inside an infinite, uncaring cosmos — that carries weight precisely because nothing cosmic requires it.

This is what separates Adams from the bleak school of absurdism. Camus built his philosophy on the confrontation between human need for meaning and the universe's refusal to provide it. That confrontation produces the Absurd — and the question becomes how to live inside it.

Adams skipped the confrontation. He was not angry at the universe for not caring. He was delighted by it. The indifference was not a wound. It was a feature. It meant everything that existed had earned its existence without cosmic assistance. The octopus. The number system. Music. These are more remarkable for being accidental.

His atheism and his wonder were not in tension. They were the same position.

The Hitchhiker's series made Adams famous. Last Chance to See, published in 1990, is possibly his most important work.

Adams travelled with zoologist Mark Carwardine to document species at the edge of disappearance: the Kakapo, the Komodo dragon, the Yangtze river dolphin, the northern white rhinoceros. The book that resulted is grief without sentimentality. Wonder without consolation.

He did not frame extinction as ecological data. He framed it as the permanent loss of an irreplaceable way of being in the world. Each vanishing species carried within it solutions to problems we have not yet formulated. Structures we cannot yet read. A form of intelligence or experience or physical existence that had no duplicate and would leave no copy.

That framing — extinction as epistemic loss as much as ecological loss — now drives how conservation science communicates urgency. It is harder to dismiss than statistics about biodiversity percentages. It is also harder to argue with. What exactly is lost when a species disappears? We don't know. That is the point. We don't know what we don't know.

Three species were named after Adams following his death in 2001: a fish, a river dolphin, and a spider. The river dolphin he had documented in Last Chance to See — Lipotes vexillifer, the Yangtze river dolphin — was declared functionally extinct in 2006. He had watched it. He had written about it. He had tried.

The failure is not a footnote. It is the argument.

Adams does not fit clean categories. He was an atheist who wrote about consciousness with more honesty than most mystics. He was a comedian who asked harder questions than most philosophers. He was a technologist — an early adopter who saw the internet's shape before most people had used it — who worried about what we were losing as we gained.

He held these positions without resolving them into a system. That was not intellectual laziness. It was, he seemed to believe, the correct response to questions that had not yet earned tidy answers.

A clean answer, for Adams, was almost always a sign that the question had been softened. The questions worth holding were the ones that stayed hard. What is consciousness? What is meaning? What do we owe the rest of life on this planet? Why does mathematics describe the physical world? These are not questions you answer. They are questions you carry.

His public conversations with Dawkins established a position that proved influential: that science and wonder are not competing responses to the universe. They are the same response. That rigour and awe are not in tension. That the honest examination of how things actually work produces more astonishment, not less, than any tradition that requires you to stop asking.

Adams described the experience of understanding natural selection — really understanding it, he said — as one of the most staggering intellectual events of his life. Not because it explained everything. Because it demonstrated that breathtaking complexity could arise from a mechanism of almost embarrassing simplicity. That you didn't need a designer for the design.

He thought that was the most extraordinary thing he had ever encountered. He was right to think so.

The Hitchhiker's series, re-read now, sounds different than it did in 1979. The comedy is intact. The timing still works. But underneath the jokes about towels and Vogon poetry and the paranoid android, there is a sustained argument about the relationship between intelligence and meaning, between computation and comprehension, between the questions we ask and the answers we deserve.

Adams was writing that argument at the moment when computers were entering homes for the first time. He updated it in interviews and essays as the internet arrived. He died before social media, before large language models, before the current moment in which the 42 problem is not satirical but structural — embedded in every system that generates confident outputs for questions whose formulation no one has properly examined.

He would have had things to say about all of it. The fragments suggest the things would have been uncomfortable.

He finished almost nothing on time. He left an unfinished novel. He died at 49.

The thinking stopped before it was done. What remained was enough to keep several fields honest, three species named, and one number permanent in the intellectual record — not as an answer, but as a reminder of what asking the wrong question looks like from the outside.