People I (Mostly) Admire 15. Tim Harford: “If You Can Make Sure You're Not An Idiot, You've Done Well.”
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Mar 28, 2026 
Tim Harford, former World Bank economist turned journalist and author of The Undercover Economist and The Data Detective. He talks about the power and limits of data visualization, why admitting mistakes matters, and how to craft memorable stories from statistics. Conversations explore historical stats, practical rules for skepticism, and creative disruption in problem solving.
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Nightingale Rose Diagram Changed Public Health
- Florence Nightingale used a Rose Diagram to show deaths fell after hospital hygiene improved during the Crimean War.
- Nightingale combined hospital visits, compiled death records, and persuasive charts that convinced Parliament to reform sanitation.
Separate Facts From Interpretation Before Judging Claims
- Break arguments into facts versus interpretation to simplify evaluation of data claims.
- Tim Harford shows how a UK health claim about weight savings collapses once you check population math and per-person savings.
Explain To Reveal How Little You Know
- The illusion of explanatory depth makes people overconfident about policy knowledge until asked to explain specifics.
- Asking someone to write out how a system works triggers humility and more cautious views on complex policies.
