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I love this — so much of expertise is tacit knowledge, and so much tacit knowledge may be picked up by watching a practitioner in action. Even without explicit instruction! Reminds me of this piece by

@SamoBurja

, who noticed: medium.com/@samo.burja/th

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Patrick McKenzie

@patio11

May 25, 2020

I got about ~40% faster solving sudoku after casually watching an hour of YouTube (turns out sudoku YouTube is a thing) and now I’m wondering how many other things in life are shaped like this.

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4:39 AM · May 25, 2020TweetDeck

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FWIW, video instruction and study is a huge part of modern Judo training, and it wasn't a thing when I was still competing. What's changed? Widespread access to Judo competition videos via Youtube, of course!