“On the contrary, it's because somebody knows something about it that we can't talk about physics. It's the things that nobody knows anything 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 — gold transfers we can't talk about, because those are understood — so it's the subject that nobody knows anything about that we can all talk about!”

— Richard Feynman

Rejoinder when told that he couldn't talk about physics, because "nobody [at this table] knows anything about it."
Part 5: "The World of One Physicist", "Alfred Nobel's Other Mistake", p. 310.
Quoted in Handbook of Economic Growth (2005) by Philippe Aghion and Steven N. Durlauf.
Surely You're Joking, Mr. Feynman! (1985)

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Richard Feynman 181

American theoretical physicist 1918–1988

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Twain did say:
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