1. There are simply more of these people that make their way to Cambridge for obvious reasons. Naturally you'll find a larger proportion in most environments th

1. There are simply more of these people that make their way to Cambridge for obvious reasons. Naturally you'll find a larger proportion in most environments there. 2. These people probably don't have much in the way of manual labor in their day-to-day work but do have a higher level of stress (manual labor and exercise reducing stress) and mental exhaustion. The guy that spends his day working with his hands might like a drink after work but it's more likely at home and not as much because he doesn't have the physical energy to stay up and drink. Someone that has mental exhaustion wants to unwind and has the physical energy to take themselves to a bar and socialize. I know I've worked a full day in one part of the country, got on a plane to another part and spent the night out drinking. I don't think this is because I'm more intelligent than a guy swinging a hammer all day but I simply had the physical energy to do it; the work wasn't physically exhausting.