I've just noticed that in a lot of my engineering focused classes people have a few similar features.
1) Emotionless faces. My friend joined me for a robotics class (because who wouldnt want to mess with robots) and was FREAKED for a second because everyone gave her a blank stare when she walked in, even the TA. I just saw it as a normal response, she was new and everyone just turned to look.
2) All very logical and pragmatic. Dare to say "i feel that..." and someone will instantly comment on it. Thats to be expected, though.
3) Clothing is generally not loud. All simple colors. Even the well-dressed ones have simple shirts, with at most a modest design on them. NOTHING like Affliction shirts, which is just awesome.
4) Depending on the field, you are surrounded by S (mechanical, aerospace, electrical, etc) or N (nuclear, chemical, material). However, none of them like the idea of a rule that has exceptions (which is why most of them dislike chemistry).
I would type more, but I have chem (of course...). Maybe later.