>But Jesus, what's up with all these super-rich people who either (a) have totally incompetent kids Regression to the mean. IQ is only .73 heritable, so it's a

>But Jesus, what's up with all these super-rich people who either (a) have totally incompetent kids Regression to the mean. IQ is only .73 heritable, so it's a one in four chance that two above average people can produce a child of "just" average intelligence.