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An expert is a person who has found out by his own painful experience all the mistakes that one can make in a very narrow field.

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Notes from Wikiquote

As quoted by Edward Teller (10 October 1972), and A Dictionary of Scientific Quotations (1991) by Alan L. Mackay, p. 35

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An expert is a man who has made all the mistakes which can be made in a very narrow field.

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Attribution

Quote text and notes from Wikiquote: Niels Bohr (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.