"Look at what they sign up for given a choice between physical science and biology. Stereotype have their basis in fact."
I am not sure what the stats are, but I was just commenting on your statement that "...girls will not attempt physics"
Notice I did not say that girls cannot DO physics. By and large the ones who do attempt physics are as good as the boys who do. I am sure those girls who do not attempt physics have the same motive as the boys who do not attempt cheerleading.