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Knowledge media face an awkward chasm between theories. The old theory was naive transmissionism: "I'll convey this knowledge by telling you about it." That's effectively books' learning model. But we know that model's wrong: learning is an active process of assimilation.
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As effective as speech and writing can be, they can always be done poorly. Good thread on the value of Feynman’s educational contribution:
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University textbooks, especially in the field of mathematics, are among the most unhelpful books that I've ever read. I used to think that this was my own shortcoming, but now I realise that most textbooks are just inherently bad.
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But, I agree there are important differences between media, and further improvements to make. The ability to rewind, speed up, or skip around a lecture on YouTube makes it immensely better than a live lecture.