April 2026
February 2026
- Feb 14, 2026ConceptsDeliberate Practice ExplainedThe characteristics separating deliberate practice from ordinary repetition: specific targets, work at the edge of ability, immediate informative feedback, and actively building mental representations. Ericsson, Krampe and Tesch-Romer's Berlin violin study is unpacked properly: the top group's roughly 10,000 hours was an average for solitary practice, not a threshold. Macnamara and colleagues put practice at 26% of variance in games, 21% in music, 1% in professions.
- Feb 13, 2026ConceptsHow Experts Build Mental RepresentationsChase and Simon's 1973 study looked like proof of superior memory until they added the control condition. Shown positions that could not occur in a real game, grandmasters performed no better than beginners, both recalling about six pieces. The advantage was never raw memory but perceptual chunking of meaningful patterns. This page traces how those representations develop, including Luhmann-style pattern libraries, template theory and the limits of transfer between domains.
- Feb 12, 2026ConceptsHow to Build Real ExpertiseBenjamin Bloom's five-year study interviewed 120 world-class performers across six fields and found almost none had been remarkable children; what they shared was a long structured path. Ericsson's violin study put the top group near 10,000 practice hours by age 20 against roughly 3,400 for the music-education group, while Macnamara's 2014 meta-analysis of 88 studies put practice at 26% of variance in games, 21% in music, 18% in sports.
September 2025
August 2025
- Aug 18, 2025IdeasLearning Inefficiency ProblemsIn the 2006 Psychological Science study, students who studied a passage once and then tested themselves three times recalled 61% a week later, those who studied three times and tested once recalled 56%, and those who studied four times recalled only 40%. Dunlosky's 2013 review rated rereading, highlighting and summarization low utility despite their popularity. The article explains the fluency illusion, spacing and interleaving.
- Aug 12, 2025IdeasBeginner-Friendly Research Project IdeasIn 2012 a self-taught programmer with no PhD, affiliation or funding tried to replicate ten well-cited machine learning studies from public data. He managed three, and the write-up became one of the most discussed posts in his field, for what it showed about reproducibility. The common beginner mistake is attempting original discovery first. Synthesis demands careful reading rather than resources, and original research starts there.
- Aug 12, 2025IdeasLow-Risk Learning ProjectsThe case against the dramatic career leap. Adam Grant's Originals cites research by Raffiee and Feng finding that entrepreneurs who kept their day jobs were 33 percent less likely to fail than those who quit. The same logic applies to skill building: separate risk into its financial, career, time and reversibility dimensions, then design projects you can exit at any stage. Internal work, private builds, informational interviews and open source all qualify.
- Aug 12, 2025IdeasLearning Projects for Critical ThinkingCritical thinking is a set of learnable habits, not a fixed trait, and these eight projects give each one something to practice on. Assumption mapping takes apart Marissa Mayer's 2013 Yahoo remote work memo. Comparative analysis uses the Reinhart-Rogoff debt paper, where a graduate student found spreadsheet errors in 2013 that weakened the original finding. Gary Klein's pre-mortem, from a 2007 Harvard Business Review piece, asks a team to imagine the project has failed.
- Aug 11, 2025IdeasSide Projects That Teach SkillsMax Howell started Homebrew in 2009 as a personal fix for package management he found frustrating on Mac OS X, written in Ruby, a language he was then learning. He later said the first two years taught him more practical systems programming than formal education would have. The useful test for any side project is whether you get stuck regularly: one that never stalls is teaching you nothing new.
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