I couldn’t find the book I wanted for my son. So I wrote it.
Dash is twelve. We unschool. His education follows his curiosity rather than a mandated curriculum—which means I’ve spent years looking for books serious enough to deserve the trust I’m placing in them.
Most aren’t.
The critical thinking workbooks teach children to spot logical fallacies. The pop psychology titles describe cognitive biases. The teen self-help books promise better decisions and improved confidence. All of it circles the target without hitting it. None of it answers the question that actually matters: how does a mind make genuine contact with reality?
That question has an answer. It comes from a physicist named David Deutsch, whose book The Beginning of Infinity is the most important thing I’ve read in the last decade.
Deutsch’s central insight: knowledge grows through good explanations, and good explanations have a specific property that separates them from comfortable stories. A good explanation is hard to vary. It makes specific claims about specific mechanisms. It can be wrong. And because it can be wrong, when it survives honest testing, it tells you something genuinely true about the world.
That standard—hard to vary, testable, honest—is not just a criterion for good science. It’s the mechanism by which any mind builds knowledge rather than accumulates information. It’s the difference between a child who can retrieve facts and a child who can think.
No book for young people is built around this. I looked.
So I wrote How To Think: Conversations From a Father to a Son. Twelve conversations, each grounded in a historical case where the standard was either honored or violated—and where the difference determined outcomes that mattered. Semmelweis, who saw what the evidence required and paid for it with his career. John Snow, who mapped a cholera outbreak while the entire medical establishment defended a theory that was wrong. Barry Marshall, who drank a petri dish of bacteria to prove a consensus false. Edison, whose notebooks turned failure into data. The Wright Brothers, who solved flight by asking a different question than everyone else.
These aren’t inspiration stories. They’re precise illustrations of what hard-to-vary thinking looks like under real conditions with real stakes.
I read it aloud to Dash. He pushes back on every chapter, asks questions I didn’t anticipate, makes connections I didn’t put there. At twelve he can’t read it independently yet—the prose asks something of the reader. But he has no trouble understanding it. That’s deliberate.
The ideas don’t need to be simplified to be given to a young person. They need to be trusted.
That trust is what’s missing from every other book in this space. The workbooks don’t trust young people with real philosophy. The self-help titles don’t trust them with genuine difficulty. They all reach for accessibility and land on condescension.
A young person who reads this book and takes it seriously will not think the same way afterward. Not because they’ve learned techniques. Because they’ve internalized a standard—a way of asking what kind of explanation they’re holding, whether it can be wrong, whether they’ve tested it honestly, whether they’re building knowledge or accumulating comfortable stories.
That’s what I wanted for Dash.
It didn’t exist. Now it does.
How To Think: Conversations From a Father To A Son is now available.
