"Speculations apparently the most unprofitable have almost invariably been those from which the greatest practical applications have emanated."

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Source : Sir John Frederick William Herschel, William Whewell, George Henry Lewes, Hermann von Helmholz, James Clerk Maxwell (1996). “The Origins of Modern Philosophy of Science, 1830-1914: Preliminary discourse on the study of natural philosophy”

John Herschel

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