Decoding Why Few Girls Choose Science, Math (washingtonpost.com)

Here's a sensible discussion of the 'gender thing' in math and science. The choices that girls want to and do make tend to move them away from math and physics. The reasons are varied, but they are real, nevertheless. On an individual basis, women and men are equally capable of excelling in math or science. If the sexes are different in their choices, then genetics and envronment both play a role, IMHO.