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Stanislaw Ulam - As one sharpens a knife on a...
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)

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

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brain form knife thought thinking value whetstone

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