How AI Remembers What You Never Told It

When Daniel asked ChatGPT for help removing wall anchors, the AI casually recalled he'd bought a rotary hammer days earlier — without being prompted to check his memory. This episode explores the engineering behind invisible AI memory: how retrieval-augmented generation (RAG) pulls relevant facts from vector databases without eating your token budget, how systems decide what to save, and why the seamlessness you feel hides staggering complexity.