"The resolution of revolutions is selection by conflict within the scientific community of the fittest way to practice future science. The net result of a sequence of such revolutionary selections, separated by periods of normal research, is the wonderfully adapted set of instruments we call modern scientific knowledge."

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Normal children of both sexes and all cultures will follow a more or less standard and universal developmental pattern and timetable, and reach approximately the same level of development at maturity. While a particular culture's need and expectations and teaching will shape the course of development and affect adult capabilities to some degree, normal individuals, whatever their native culture, if transplanted and taught, could learn to meet the normal demands of their adapted cultures.

— Stella Chess