Even if it were true that women just aren't interested in math and science, that's a different issue. Even if somehow our DNA mandated the situation that only 13% of engineers were women, there's no reason for those 13% to put up with the bullshit they're subjected to. So if you start with 13% women through some natural process, then a lot of those women have to put up with the issues the article mentions, wouldn't a lot of the them leave the industry and lower the percentage further? I think that's a big part of what's happening.