• What I mean when I think intelligence:
• the correlation between most intellectual abilities, while positive, is only about 0.2 - 0.4 via Scott Alexander link
• Intelligence IQ is a good predictor of performance on different tasks but not as good as five personality traits via Spencer Greenberg
• Typical estimates for adult IQ found it was about 60% genetic, 40% unpredictable, and barely related at all to parenting or family environment.
• Links