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Twenty-two million taxi trips on an 8 GB laptop in 23 seconds. What each of these tools actually is, in plain language, with a notebook you can run yourself.

One train/test split can make one model look better than it is and another look worse, in the same experiment. Here's what that looks like with real numbers.

Fast-time simulation models hours of operation in seconds, so you can test decisions too risky or costly to try for real. What it is, how a study works, and when a digital twin is worth building.

Optimization is everywhere, but most people never see it. Here's what happens when you get it right, and what breaks when you don't.

How I built an interactive 3D flight visualization app in one weekend using Claude Code. A story about combining domain expertise with AI-assisted development.