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Most mental models are survivor stories you can't verify. Two filters — true without a winner, stable under stress — for the few worth keeping.
Machiel Reyneke
Fire engineer turned product manager. Writing about software, AI, running, and the tools I build.
Latest posts
The Circle Packing Problem For a Watertight Nuclear Strategy
The numbers don't add up. But I've been preparing anyway.
Our Real Plan
A field guide for the newly liberated.
Big Boys
A poem about fatherhood, time, and what matters.
Ambitions
A poem about the corporate climb.
A Serenity Prayer
For those in power.
4,500 Physicians Agree
On breakfast, engagement rings, and regime change.
Bullish on AI, Bearish on Everything Else
AI might displace knowledge workers faster than the economy can absorb. Here's how I'm thinking about the deflation story, the policy response, and portfolio positioning.
My Doctors Almost Got a Heart Attack When They Saw My Cholesterol
My LDL is high. My doctors want me on statins. But when you actually look at the full picture - Lp(a), triglycerides, insulin, inflammation - the story changes completely.
Feed.
A poem from the algorithm's perspective.
Why Killing Epstein Was a Catastrophic Engineering Failure
In physics, a metastable system looks perfectly stable - until it isn't. The Epstein network held for thirty years. Then someone tried to stabilise it.
Why Vampires Live Forever
The modern longevity movement's obsession with blood transfusions makes perfect sense — if you accept that Peter Thiel and Bryan Johnson are vampires.
What the Longevity Experts Don't Tell You
I went looking for the common threads among history's most prominent longevity figures. What habits, principles, and practices unite them? Quite a lot, it turns out.
18:57
I had an AI coach, a custom analytics app, and six weeks of heart rate data. The thing that actually mattered was deciding not to stop.
AI Slop Is a Setup Problem
The difference between useful AI and generic mush isn't the model. It's everything you haven't told it.
The Tyranny of the Available
You are not the captain of your ship. You are a chess player who gets to set up the board before the game.
What happens when you build a todo app for you and your AI assistant
I built Slate knowing Claude would be using it too. Six days of data shows two interfaces, two jobs.
Breaking the Feed
How two hours of clicking 'Not interested' changed what I build.