In 1971, Cattell published a book entitled Abilities: Their Structure, Growth, and Action. In it, he posited that there were two types of intelligence that people possess, but at greater abundance at different points in life. The first is fluid intelligence, which Cattell defined as the ability to reason, think flexibly, and solve novel problems. It is what we commonly think of as raw smarts, and researchers find that it is associated with both reading and mathematical ability.[4] Innovators typically have an abundance of fluid intelligence. Cattell, who specialized in intelligence testing,
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