Interesting article at Volokh and discussions. Basically, the admission office of selective schools are looking for female applicants who stand out from other female applicants. One way to stand out, is to be good at math and science, want to major in science/engineering, and be athletic.
It is interesting to note that, 40+ years after the general civil rights movement, America still faces a demographic disparity in the undergraduate physics and engineering population.
It is also interesting to note, for example, the majority female undergrad math population in Portugal, and the majority female undergrad engineering population in UAE colleges.
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