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Raymond Cattell
Raymond Bernard Cattell (20 March, 1905 - 2 February, 1998) was a British and American psychologist who theorized the existence of fluid and crystallized intelligences to explain human cognitive ability. He was famously productive throughout his 92 years, and ultimately was able to claim a combined authorship and co-authorship of 55 books and some 500 journal articles in addition to at least 30 standardized tests.
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