Exercises: The Case for Imperfect Knowledge

Part A: Reflection

A.1. The chapter argues that "less wrong" is not a consolation prize but the only kind of progress that is possible. Do you agree? Is there a field in which "perfect knowledge" is achievable — or is every field permanently "less wrong" about something?

A.2. The "asymmetry of correction" says the cost of being wrong scales with how long the error persists. Calculate the asymmetry for a specific case: how many additional lives were affected by the 30-year delay in accepting H. pylori versus a hypothetical 5-year delay? What about a 50-year delay in correcting forensic science versus a 10-year delay?

A.3. The chapter defines epistemic humility as "epistemic courage." Explain why. Identify a situation in your professional life where epistemic humility required more courage than epistemic certainty.

Part B: Synthesis

B.1. Write a one-page summary of your complete Epistemic Audit — the accumulated assessment from 40 chapters. What are the three most important findings? What is the single most actionable recommendation?

B.2. If you were to teach the core ideas of this book to a colleague in 30 minutes, which three concepts would you choose? Why those three? How would you present them to maximize the chance of changing your colleague's thinking?

B.3. Return to the three beliefs you wrote down at the beginning of Chapter 35 (the 95%+ confidence items). After completing the entire book, are you still as confident? What has changed — your beliefs, your confidence, or your relationship to confidence itself?

Part C: Looking Forward

C.1. Predict: what is the next major correction in your field? Apply the Correction Speed Model (Chapter 22) to estimate the timeline. What would accelerate the correction?

C.2. Design a "five-year epistemic improvement plan" for your field, organization, or team. Using the seven design principles (Chapter 37) and the nine tools (Chapter 34), identify the three most impactful structural changes and outline an implementation strategy.

C.3. Write a letter to yourself, to be opened in five years. In the letter, state: (a) what you currently believe is true in your field, (b) what you suspect might be wrong, and (c) what evidence would change your mind. Seal it. In five years, compare your current beliefs against this baseline.