An MIT student made a documentary a few years back about bums on the street of Cambridge. While the evidence is clearly anecdotal, none gave off the aura you d

An MIT student made a documentary a few years back about bums on the street of Cambridge. While the evidence is clearly anecdotal, none gave off the aura you describe. They were completely disconnected from the MIT/Harvard community. Instead, they were entirely engrossed in their own world (and in some cases, how they got there).