"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."
— Niels Bohr

January 1, 1970

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Original Language: English

Sources

Variant: An expert is a man who has made all the mistakes which can be made in a very narrow field. — As quoted by Edward Teller (10 October 1972), and A Dictionary of Scientific Quotations (1991) by Alan L. Mackay, p. 35