It's the same here in Switzerland, more girls than boys enter Universities by now. But i think it hasn't anything to do with intellect at all. It's simply because school subjects that appeal more to girls than to boys, i.e. languages, have become more important in recent years.
Furthermore, boys drop out of high school at a much higher rate than girls.
So i think the process of making the school system fairer for girls has created unfairness for the boys.
Back to the topic i think Tom pretty much summed it up: Men just want to win harder than women. That's why more of them achieve really outstanding things.