“As one sharpens a knife on a whetstone, the brain can be sharpened on dull objects of thought. Every form of assiduous thinking has its value.”

— Stanislaw Ulam

Source: Adventures of a Mathematician - Third Edition (1991), Chapter 15, Random Reflections on Mathematics and Science, p. 278

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Stanislaw Ulam 33

Polish-American mathematician 1909–1984

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