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I mean, forget about students that excel in science (we certainly do have some of those), but the majority of American students with opportunity for higher education seem to choose a course of study other than science. Why ?
I will piggyback upon paisano's comment and add that many science departments are also inhospitable to women to varying degrees, so that might be another reason for the lack of interest among undergraduates.
Female undergrads seem to do well, but once they get into grad school and post-graduate work some have reported problems with discrimination.