“Humankind gains enormous power by building large networks of cooperation, but the way these networks are built predisposes us to use that power unwisely.”
If you’ve been following my book reviews, you already know. Yuval Noah Harari is one of my favorite authors. Sapiens is my most favorite book of all time. Homo Deus blew my mind with its predictions about technology and the future, predictions that are literally materializing right now with AI. So when Harari dropped Nexus, I didn’t hesitate for a second.
And he delivered. Again.
The Through-Line
Here’s what makes Nexus so powerful. It takes the central thesis of Sapiens (that humans dominate because we cooperate through shared stories) and reframes it through the lens of information networks. Stories are not just stories. They’re nodes in a network. And the structure of that network determines everything: who has power, how it’s used, and whether truth even matters.
Think about that for a second. From cave paintings to the Bible to bureaucracies to social media, every single one of these is an information network. And Harari argues that understanding how these networks function is the key to understanding human history.
What I love is that he refuses to treat technology as the hero or the villain of the story. The printing press didn’t just spread science and reason. It also spread witch-hunt manuals and centuries of religious bloodshed. The same network can carry truth or madness. What matters is how it’s wired.
Information Is Not Truth
This was the insight that hit me the hardest. We tend to assume that information exists to convey truth. It doesn’t. Information exists to create connection. Its primary function is to bind people together into cooperative networks, not to accurately describe reality.
Harari calls the assumption that more information automatically leads to more truth the “naive view” of information. It’s the comfortable belief that if we just flood the world with data, wisdom will follow. But look around. We have more information than any generation in history, and we are arguably more confused than ever. Information overload doesn’t produce clarity. It produces noise, and noise is fertile ground for the loudest, most emotional story to win.
Myths, religions, propaganda, national anthems, corporate mission statements. Most of the information that has shaped human civilization is, technically speaking, not true. But it works. It gets millions of people to coordinate, cooperate, and build things together.
The problem? When the stories that hold a network together drift too far from reality, the whole system eventually collapses. Harari frames this as a constant tension between order and truth. Every society in history has had to balance maintaining order through shared stories against acknowledging truth, which often undermines those very stories. Get the balance wrong, and empires fall.
Mythology Versus Bureaucracy
One of my favorite chapters digs into the two great tools every large network uses to hold itself together: mythology and bureaucracy.
Mythology gives people a shared story to believe in. Bureaucracy gives them the filing cabinets, records, and rules to actually run things at scale. You need both. A religion needs its sacred texts (mythology) but also its councils, calendars, and tax collectors (bureaucracy). A modern state needs its flag and founding myth, but also its passports, databases, and courts.
Here’s the catch. Bureaucracy reshapes reality to fit its own categories. Once a government decides there are exactly these professions, these genders, these tax brackets, the messy real world gets forced into those boxes. The map starts to rewrite the territory. As someone who has wrestled with paperwork in a dozen countries while traveling, this landed hard. The form is never just a form. It quietly decides what counts as real.
Self-Correcting Mechanisms
This is where it gets really interesting. Harari argues that what makes democracies, science, and free press special isn’t that they’re inherently “good.” It’s that they’re self-correcting. They have built-in mechanisms to detect and fix errors.
Science publishes results, and other scientists try to disprove them. Democracies hold elections, and voters can throw out bad leaders. Free press exposes corruption and lies. These aren’t perfect systems, far from it, but they tilt the balance toward truth over time.
Authoritarian regimes, by contrast, lack these mechanisms entirely. They optimize for order at the expense of truth, and eventually reality catches up with devastating consequences. History is littered with examples, from crop failures denied by ideology to wars launched on lies that the system was incapable of questioning.
Democracy and Dictatorship as Information Systems
Harari makes a reframe here that I haven’t been able to stop thinking about. He says democracy and dictatorship are, at their core, two different ways of processing information.
A dictatorship is a centralized network. All information flows to one point, and all decisions flow back out. It’s fast and decisive, but it’s brittle. The man at the center surrounds himself with yes-men, the feedback loop breaks, and he ends up making catastrophic decisions because nobody dares tell him the truth.
A democracy is a distributed network. Information is spread out, debated, contested, and corrected by many voices. It’s messier and slower, but it’s far more robust because no single failure point can poison the whole system. Seen this way, the fight between freedom and tyranny isn’t just moral. It’s a fight over network architecture.
The AI Problem
And here’s where Nexus connects directly to what Homo Deus predicted years ago. AI is not just another technology. It’s the first non-human entity capable of creating and spreading the stories that organize society.
Harari frames AI as a genuinely alien intelligence, the birth of a new inorganic network running on a clock and a logic completely different from ours. For the first time, the nodes in our information network are no longer all human. Decisions about what we see, believe, and argue about are increasingly made by entities that don’t sleep, don’t die, and don’t share our instincts.
Think about what social media algorithms already do. They don’t optimize for truth. They optimize for engagement. And engagement means outrage, fear, tribalism, the exact opposite of the self-correcting mechanisms that keep societies functioning. We’ve already seen this play out in elections, in public discourse, in the slow erosion of any shared sense of reality.
Now add total surveillance to the mix. Harari warns that AI plus ubiquitous data collection could build a regime of control that makes the old totalitarian states look clumsy. The Stasi needed armies of human informants. An AI-driven system needs only your phone, and it never gets tired, never forgets, and never looks away.
His warning is stark. In a completely free information fight, truth tends to lose, because lies are cheaper, simpler, and more emotionally satisfying. Without guardrails, AI-powered information networks will amplify humanity’s worst tendencies, not its best ones. Social media was the appetizer. AI is the main course, and we’re not remotely prepared for it.
The Harari Trilogy, Complete
Sapiens explained what stories do, they enable mass cooperation. Homo Deus warned where technology is heading, toward a world where algorithms know us better than we know ourselves. And now Nexus ties it all together by arguing that information networks are the through-line of human history, and AI is the biggest disruption to those networks since the invention of writing.
If you’ve read Sapiens and Homo Deus, Nexus is the conclusion you’ve been waiting for. It’s not just a sequel, it’s the synthesis. Everything Harari has been building toward lands here.
Final Thoughts
Harari remains one of the best thinkers of our generation. His ability to zoom out and see the big picture, connecting stone age cave art to AI algorithms in a single coherent argument, is unmatched. Nexus is not as groundbreaking as Sapiens (let’s be honest, nothing ever will be), but it’s the most relevant of his books for understanding the world we’re living in right now.
Every chapter feels like a warning and an education at the same time. If you care about where humanity is heading, and especially if you’re paying attention to the AI revolution unfolding in real time, this is essential reading. A+ from me.
Thanks for reading.
— Leonidas
