Absolutely true. The value I got from preparing and delivering a ten-week lecture and seminar module on design and patent law goes way beyond what I was paid or the CV boost. I genuinely came out of it finally getting a good grasp on some hitherto abstruse bits of IP law, because I'd both had to find a way to explain them clearly to others and answer questions on them.
If anything I'd split that bottom layer into two - lecturing on a subject, and running (as opposed to just participating in) interactive seminars or tutorials on it. You really get to know your stuff doing the latter.
Yeah, I've found that doing tech support for a product forces you to learn it really well as well - because you're being forced into the corner cases all the time. Anything which makes you explore how all the odd bits of something fit together brings how new chunks of understanding.
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If anything I'd split that bottom layer into two - lecturing on a subject, and running (as opposed to just participating in) interactive seminars or tutorials on it. You really get to know your stuff doing the latter.
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