>It is helpful to think of the subjective perception of intelligence as analogous to the subjective perception of temperatures ... . Before the invention of the thermometer, temperature was a matter of subjective judgment. The invention of the thermometer made it possible to objectify the attribute of temperature, to quantify it, and to measure it with a high degree of reliability. With some important qualifications, the situation is similar in the case of intelligence tests.<
Arthur R. Jensen
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