I think I finally figured out the whole reason why people never suspected Clark Kent was Superman: I took off my glasses and put them on my desk this morning. One of my co-workers stopped on by and asked me if I wore glasses. (Now, to put this in perspective, I have worn this particular pair of glasses every single day for over 2 years). I looked up, and gave her a quizzical look of "are you serious"? She was, so I put on the glasses. She then said I looked normal. So, in that brief instance I now understand how Clark Kent managed to keep his Superman persona secret: it's all about the glasses. Try it sometime, and you'll see what I mean.