Lewis Terman was an American #psychologist and prominent eugenicist. He was the pioneer of the educational psychology in the early 20th century. Terman revised Binet-Simon Scale into Stanford–Binet Intelligence Scales and used IQ, which can easily understand the level of intelligence. To prove the theory of the intelligence genetic, he initiated a long-term study, continued tracking and recording more than 1,000 gifted children, it was the famous study, the Genetic Studies of Genius.