"Behold the turtle. He makes progress only when he sticks his neck out."
"Science is a dynamic undertaking directed to lowering the degree of the empiricism involved in solving problems; or, if you prefer, science is a process of fabricating a web of interconnected concepts and conceptual schemes arising from experiments and observations and fruitful of further experiments and observations."
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Source: Quoted in Notes on the Harvard Tercentenary, ed. David McCord (1936)
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