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I was so struck by the professor's willingness to be respectful and appreciative of DS's obvious knowledge and perception of the subject matter

What a wonderful person.

I constantly seek out just these kinds of scenarios to balance out the more common experience of an adult underestimating them.

I do have a concern that some very advanced children are at risk of becoming disrespectful and/or distrustful of adults without exposure to the former. IMHO.