There is an issue with one of the human hair types. (at least for me, i don't know if others can see it or not). the issue manifests itself with physics enabled as a bald spot right on the back of the head.
it wouldn't bother me so much if it was in a place your not staring at all the time.
Could you please look into it, id really like to turn on physics but i cant stand this eyesore.
here is an image of what occurs.
http://img829.imageshack.us/img829/5214/80582996.jpg