What surprised me of this bunch was the general lack of curiosity, passion, and depth that many of them had - it jarred my world view. These were people that I dreamed of being around, when I was a kid. And, they just seemed like normal people, nothing special.
Over much time and after talking with many of them, I realized that many had pursued the Phd. (or equivalent) not because of any innate passion or ability, but just because that was what was expected of them. They did it because that's what people did in their world. It was then that I realized that many poor kids from the rust belt probably just did what they believed that people did.