Two thoughts popped into my head after reading this. 1. Beautiful people tend to have more confidence. If you recall from grade school there's an old rule ab

Two thoughts popped into my head after reading this. 1. Beautiful people tend to have more confidence. If you recall from grade school there's an old rule about multiple choice tests which says "if you don't know for sure go with your first instinct". People with an abundance of confidence do this naturally while those without confidence will often talk themselves out of the right answer. 2. Beautiful people get more attention. For better or worse a beautiful person probably drew the attention of their instructors since it's human nature to be drawn to attractiveness. This means a more personalized education which in turn should translate into a slightly higher IQ. Given the difference recorded here is only between 5% and 6% I could see small factors (like the ones listed above) being the cause of such a phenomenon