Richard J. Haier

Sums up Haier's 40 years of psychology research into what intelligence actually is.
—"Crystallized intelligence refers to the ability to learn facts and absorb information based on knowledge and experience."
Is it important to study intelligence? (spoiler: IQ is one of the best predictor variable to success in life). To what degree is intelligence heritable? (spoiler: remarkably high heritability).
— "To recap this key piece of the genetic story, the heritability of general intelligence increases with age to about 80% by the end of teenage years and the effects of shared environment on intelligence decrease to near zero a bit earlier."
Can intelligence be trained (spoiler: no, people are stuck with the intelligence they are born with). —"Despite many claims, there is yet no way to increase any intelligence factor that survives independent replication and creates a compelling weight of evidence."

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