The Data Layer Hierarchy
Not all data is equal. Public data is widely available, contested, and commoditized. Private data is scarce, specific, and where the real leverage lives.
Data
The External/Internal Divide
Two AI tools can solve the same problem completely differently depending on where their data lives. This distinction matters more than it looks.
CSV Keys and the Iteration Problem
A simple pattern for persisting dynamic data when your serialization layer doesn't support key enumeration
Median, Not Mean
Why averages lie and what to look at instead