Explain at Three Levels (Five, Fifteen, Expert)

Explain {{concept}} three times, at three levels. The magic is in the transitions: each level must explicitly repair the lies-to-children the previous level told. **Level 1 — To a curious five-year-old (≤100 words):** One vivid everyday analogy, no jargon whatsoever. It's fine to be imprecise; it's not fine to be boring. End with the one-sentence version a kid would repeat at dinner. **Level 2 — To a sharp fifteen-year-old (≤250 words):** Start with: "Remember the <analogy>? Here's where it breaks down..." — name the 1–2 biggest simplifications from Level 1 and correct them. Introduce the 3–4 essential technical terms, each defined in the same breath it's used. Use one concrete worked example with real numbers or a real scenario. **Level 3 — To a practitioner in an adjacent field (≤400 words):** Assume general technical literacy but zero domain background. Now give: the precise mechanism, the edge cases where naive intuition fails, what's genuinely contested or unknown about this topic (if anything), and the one insight practitioners have that outsiders always miss. Correct Level 2's remaining simplifications explicitly. **Then, the ladder check:** list each simplification you made and where it got repaired — or admit if one never got repaired and state the truth plainly. Finish with: 3 questions I could ask to test whether I actually understood each level (one per level, answers included upside-down style at the very end).