Show Your Work

This book makes a single unusual promise: that every quantitative claim in it can be checked by someone who does not trust me. The Kronos design basis is not a set of assertions but a published, open-access body of work — the core physics of both machines and the AI control results are documented in open papers and reproducible simulation deposits. Building that record, and showing exactly how any number in it is regenerated, is the job of the simulation register at the back of this book. This section gives you only the short path in: how to check a number, where the deposits live, and the standing rules I hold myself to.

How to check a number in this book

The method is meant to be usable, not decorative. Find the claim — say, the breeder's tritium-breeding lever, or the disruption predictor's area-under-curve of 0.990. Trace it to the paper or whitepaper that states it, and from there to the deposit that produced it. Pull the deposited inputs and analysis at its DOI, rerun it, and compare what you get to what this book prints. If they match, the claim has earned a little of your trust; if they do not, you have found something worth writing to me about, and the record is specific enough that we can locate the disagreement rather than argue about it in the abstract. Nothing in that loop requires my permission or my presence, which is exactly how it should be.

The permanent addresses for that loop — the registered simulation suite and the full DOI table that ties each headline number to the code and inputs behind it — live in the simulation register. That is the canonical index of the open record; rather than reprint it here and let two copies drift apart, I point you there.

What is not in this book

Two things, on purpose. First, no financial figures — no plant costs, no levelized cost of energy, no fuel prices, no margins, no capital structure. Those live in materials shared privately with partners under agreement; a public book is the wrong place for them, and their absence changes none of the physics. Second, no unpublished or pending intellectual-property claims stated in a way that could compromise them. Where the program's protected work is referenced, it is described only at the level already made public.

A standing correction policy

Numbers move as the work advances. That is not a failure of the work; it is what work looks like when it is real. The commitment here is not that nothing will change — it will — but that every change will be visible.

So the policy is specific. When a number moves, the old value is not quietly overwritten as though it had never been printed. The change is recorded — in the next version of this book, in the deposits, and in the errata that accompany the papers — with the previous value, the new value, and the reason it moved. A reader who owns an earlier version should be able to see exactly what changed between their copy and the current one, and why, rather than being left to wonder whether their memory is faulty. Corrections are additive to the record, not subtractions from it.

Some changes are refinements: a figure sharpens as a model improves or as better data arrives, and the direction of travel is toward the truth. Others are genuine reversals, where an earlier claim proves wrong. This book contains one of those, and it is printed in plain sight: when I first wrote this in 2024 I was too optimistic about how soon quantum computing would help this work. It will not, this decade. The honest near-term quantum contribution is in sensing and diagnostics, and the computational gains come from quantum-inspired classical methods and offline calibration, not from a quantum computer in the control loop. I would rather correct that in the open, at the front of the book's own argument, than let an old enthusiasm quietly age into a false claim.

There is a reason this policy is not merely good manners. A field that spent seventy years being wrong about its own timeline — always "thirty years away" — has spent its credibility, and no amount of confidence buys it back. The only currency left is verifiability: claims that can be checked, corrections that can be seen, and a standing invitation to catch me. That is what this section, and this whole book, is offering. It cannot ask to be believed. It can only show its work, keep showing it as the work changes, and let you decide.