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Hmm, that seems like a pretty cynical point to make. He still deeply is in the field of mathematics, as a math educator. He even makes this exact point in this video, that communicating math is still a hard and respectable part of the profession.
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As a math educator doing what you love you require an audience.

Its kind of in Grant's incentives to push the interest for mathematics, because without an audience he won't be able to keep doing what he loves.

Like, my old uni has a history department, and had an Egyptian history teacher. This was at some point deemed a pointless use of resources because there was no role in society except for teacher of the same subject after that, and she was offered a role in admin. She was not happy in that role.

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Sorry I didn't mean it to be cynical, it just came to mind
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I remember a post in... Reddit I think it was? where I commented on an early video discussion that he should teach online full time, because that kind of intuitive education was sorely needed. He actually answered the comment, along the lines of "that would be cool but I already have my hands full in $UNIVERSITY".

I think it was relatively soon after that interaction that he started doing youtube full time. I've always wanted to think I made a teeny tiny contribution to move the needle there :)

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Yeah. All due respect to Grant Sanderson, he is both great scientist and great entrepreneur, but getting an entry-career advice from a multi-millionaire is probably not quite the best idea out of all ideas in a popular discourse. Especially if the field in question was famous for producing posts discouraging people from going all-in in it, for many many years even before AI craze.
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