Blackboard - Grades - Comb Your Hair (Boys) and Smile (Girls) - NYTimes.com
When all three characteristics were considered together, boys experienced a statistically significant grade premium for good grooming and a penalty for being slovenly. Dr. French says he was surprised to see a “marginally significant” penalty for above-average attractiveness. For girls, pleasant personality had the most impact on grades, and to a lesser extent good grooming. Attractiveness didn’t rate.
