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https://en.wikiquote.org/wiki/Richard_Feynman#The_Pleasure_of_Finding_Things_Out_(1999)
"I'm really still a very one-sided person and don't know a great deal. I have a limited intelligence and I've used it in a particular direction"
As little as possible, to give me time for my rather narrow spectrum of interests, none of which really rises to the level of expertise.