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davidr comments on Rationality Quotes - July 2009 - Less Wrong
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"On the contrary, it's because someone knows something about it that we can't talk about physics. It's the things that nobody knows about that we can discuss. We can talk about the weather; we can talk about social problems; we can talk about psychology; we can talk about international finance... so it's the subject that nobody knows anything about that we can all talk about! "
-- Richard Feynman
He'd be correct if he'd said we can discuss the subjects we think no one knows anything about. I wonder; did Feynman think no one knew anything about psychology?
Given the story of his encounter with the psychologist (also in Surely You're Joking, Mr. Feynman!), I'd say he thought so, and ditto with the other fields he mentioned. I believe he was criticizing acceptable social conversation (at the Nobel Prize banquet, I believe!) as being restricted to topics on which nobody sufficiently facile with words could be conclusively shown to be wrong.
The conversation took place in 1965; if Feynman believed that, as is likely, he was very probably correct. On the other hand, a lot of people probably thought they knew something about psychology; it was a popular subject at the time.