Thinking practice
Thinking improves with feedback, and most people never get any on their reasoning. Each tool here makes you commit to a judgement, write it down, and check it against reality later. Some keep a public record; some stay in your browser.
Prediction log
Forecast real events with a probability, resolve them later, and get a Brier score and a calibration chart.
Forecasting · On the recordDecision journal
Record a decision before the outcome is known, then review it: good call, or good luck?
Judgement · In your browserSteelman arena
A daily contested question. Write the strongest case for the side you disagree with first.
Fairness · In your browserExplain it simply
Explain a concept for a smart twelve-year-old; the jargon check shows where you are bluffing.
Understanding · Drafts private, notes publicParadoxes and thought experiments
Classic problems where intuition is confidently wrong. Commit to an answer before the explanation.
Intuition · On the recordCommonplace book
The best passages from what you read, searchable, so your reading adds up over the years.
Memory · On the recordClassic papers and essays
A reading list of the foundational papers, each with a summary and what it changed.
Foundations · On the recordWhat changed my mind
Each time a belief moves: what you thought, what you think now, and what convinced you.
Updating · On the record