Are you open to the idea that bias explains less than 100% of the discrepancy? If not, why?
Yes, I'm open to it. But I truly do not think we're at the point yet where we can say, well, hey, we've absolutely done ALL we can, nothing is changing anymore, and now we can pronounce that any remaning differences are biological. Girls' and women's performance on math and science measures is in RAPID flux and is NOT by any means internationally consistent (look at the study Dude posted above), as we might expect if we were looking at a biologically constant issue. Their educational choices WRT the degrees they choose to pursue are also changing rapidly. There have been HUGE changes in 20 years. 20 years!! That is NOTHING. Absolutely and completely meaningless in evolutionary time.
Look at how fast our society is evolving. It's incredible. Our own parents would likely have laughed their heads off at the idea of a serious female contender for president. Let's continue to give it time and to give our young girls opportunity. The good news is that I think they're going to take it anyway, regardless of people who are still wandering around telling them they aren't interested in engineering due to their vaginas. (My own DD won the "build the tallest thing out of these materials in X amount of time" contest at her school's engineering night last year.)
