Hand-picked from the archive.
The case that cheap intelligence is a category change, not a productivity story.
The math that says $2 trillion of AI lab value can't be justified by any plausible earnings model.
Ego, belief updating, and the limits of your own confidence — the mental model lessons from the felt.
Eighteen months of 311 data: poor Philadelphia neighborhoods wait 50%-300% longer for the same city services.
What a federal court actually said about Philadelphia's selective school admissions — and why it matters for the next decade.
Why taxing your Uber isn't a solution — it's a symptom of $214 million the city isn't collecting in property taxes.
A short, specific case for why this city works — written by someone who chose Fairmount.
The argument that education is a moral good, not just a path to a better job.
The conversation that taught me the difference between being right about the destination and wrong about the route.
The dad-bod mile in Fairmount Park with an 8-month-old in a stroller, run before anyone else is awake.