Lewin spent 25 years recording lectures. That's a quarter century working on them after he was singled out as the guy to do it, some combination of already being a good lecturer and willing to put in the work. And, no, MIT does not have a lot of compelling lecturers -- the teaching prize is known as the "Kiss of Death Award."
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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