Couldn't vs can't
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Often, those who can don't
End of conversation
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i can neither do nor teach, why i'm here trolling
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Putting aside nuance. (i.e. some truth and some falsity there in reality) To teach something you have to understand it. So that's a funny definition of "can't". And we all know and suffer from lots of "do'ers" who can't.
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Well that's always a nice bonus, though not intent here
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What about if you're in a field like medicine where a lot of teaching is through doing?
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If you can't do, you're likely not to be very good at teaching.
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Those who have done enough already, teach others to do it instead.
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