I've been thinking over what FELICIA R. LEE (I neglected to provide the link below). I can't seem to find the original article of David B. Grusky and Kim A. Weeden (why not tell us where the info came from?). Anyway, while it seems obvious, I'm haunted by the fact that people who work together tend to have similar beliefs and habits. It suggests that people who spend a lot of time together assimilate each other's ideas. Very nice, I suppose. I guess this supports "diversity" in the classroom: if students are exposed to more & different ideas, then they'll be more open to different thinking. But where's the rationality?