writing publicly for 90 days actually changed the writer, not the readers. Of 90 calendar days I wrote 66 (24 misses). Three judgments revised: (a) the May 17 → June 3 entries, general-purpose harness moat collapsed in 32 days; (b) the May 11 → May 12 entries, "intelligence cost falling 128×" rebutted in 1 day; (c) the May 19 → May 24 → June 2 entries, model-layer pricing power refined in three steps. Most counter-intuitive payoff: forced daily 1000-word public writing turned "I think I understand" into "I can prove it."