Explain a complex topic without dumbing it down

Explain {{topic}} to me. I'm smart but I don't have background in this specific area.

Structure:
1. **What it is** in one sentence (no jargon)
2. **The mental model** — what should I picture in my head?
3. **A worked example** — show it in action with concrete numbers/scenarios
4. **The thing most explanations skip** — the subtle but important point that takes people from "I sort of get it" to "I actually get it"
5. **What I should be able to do after reading this** — concrete checklist

If a term is unavoidable, define it inline the first time. Don't pretend something is simpler than it is.