Someone asked on the CFAR mailing list about how to choose where to send their child to school and it turned into a discussion on the effect sizes of different pedagogical interventions and like … I feel like all of this is just rounding error and the only things that actually matter are 1) how smart are the other students and 2) how smart are the teachers. Thinking about interventions might be helpful at a policy level but you should really really just send your smart kid to where the other smart kids are.