First of all, I'm sorry if this thread has already passed a certain date beyond which I'm not supposed to revive it.
It seems that more than one poster above has stated that being a physics major can be considered diverse due to the heavy emphasis on critical thinking and problem solving that that requires. I started as a bio major under the mistaken assumption that that's the course pre-meds should take, but at the end of my junior year I decided that I did not want to spend my last year on rote-memorization bio courses, and switched to biochem, which at my university required me to make up most of the additional requisites of a regular chem major (inorganic and physical chem). I enjoyed this more because chemistry had a lot more emphasis on critical thinking and problem solving (though less than and different from physics). But would the critical-thinking mentality shown by my preference for chemistry (bio-, organic, inorganic, and physical) be too dilute, in comparison to physics, to discuss as "diversity"? Thanks.