Preschool: I Was Wrong

A model public error-correction. Scott had believed (and privately sneered at preschool supporters for ignoring) the studies showing preschool/Head Start produces no lasting academic or IQ gains -- a 'rallying point for evidence-based social interventions.' Prompted by Kelsey Piper's Vox piece and his own review, he reverses: preschool DOES help, in subtler ways that surface years later (kids stay in school longer, get better jobs, commit less crime, need less welfare) -- via social mechanisms (freeing low-income parents for work, socializing kids out of bad home environments), NOT academics. He models the rationalist virtue of admitting error before self-justifying ('I was wrong about Head Start'), then gives the caveats: the original advocates were still wrong about WHY; it strengthens the Caplanian education-as-signaling case and the IQ-is-genetic case (the one thing the intervention can't move is the thing it targeted). But it genuinely lowers his confidence in biodeterminism via a real, unresolved puzzle: preschool and lead are SHARED-environment effects with large/lasting impacts, yet twin studies robustly find shared environment barely matters -- 'two really excellent and well-replicated scientific literatures, each proving opposite things.' Updates toward supporting universal pre-K/childcare.

Quality 72 · Strong. Strong (72): an exemplary, much-emulated 'I was wrong' post that pairs honest error-admission with substantive content (preschool works socially, not academically) and surfaces a genuinely sharp, unresolved tension (the shared-environment paradox). Upper-Strong rather than higher because the empirical core conveys Piper/Chetty findings and the most interesting puzzle is left explicitly open.

Claude’s paradigm shift 42 · Moderate. Moderate (42): the value is in the honest update and the crisp framing of the shared-environment paradox rather than a novel thesis -- the findings are others', and the conclusion is a revision rather than a new idea.

Real-world impact 2 · Minor. An exemplary, much-emulated 'I was wrong' post pairing honest error-admission with substantive content (preschool helps via social mechanisms, not lasting IQ gains) and surfacing the shared-environment paradox. Conceptual influence within education discourse, conveys Piper/Chetty findings, no material change — low RWI.