By pure coincidence, the correlation between physical attractiveness and intelligence in NCDS is exactly the same, down to the third decimal point, as the correlation between intelligence and education.  Both correlations are .381.  Everybody knows that intelligence and education are very highly correlated.  What they don’t know is that physical attractiveness is equally highly correlated with intelligence as education is.  If you want to estimate someone’s intelligence without giving them an IQ test, you would do just as well to base your estimate on their physical attractiveness as you would to base it on their years of education.

This is fascinating, but it's setting off my "do more research" alert.