Interesting. I've occasionally wondered why my hair (from scalp) can reach barely half way down my back, even after leaving it for decades uncut, while other people (typically women?) can grow it to the floor.
I've always wondered if the almost universal preference for women to have long hair is linked with their ability to have long hair, while for males people (not you :) typically want it short, which matches what males are able to naturally do.
i.e. which came first? The ability for hair of a certain length, so that's what people like, or if people like hair a certain way so natural selection helps out.
