[facepalm]

In this video Dan Ariely mentions some interesting research about the effects of beauty: http://bigthink.com/videos/dan-ariely-on-advantages-of-physi...

Apparently research has shown that while taller people tend to earn more money, it depends on their height during puberty. People grow at different times, so some people who are tall later in life might not have been so in puberty, while others where already tall in puberty.

The hypothesis is that the effect of tall people earning more might actually be the result of them being more confident, due to already having been tall in their teens. Some effects of beauty might show the same relation.