Just a thought about Boston. I live in Boston and it definitely is as described, though I have heard that it (especially Cambridge) bloomed culturally more when overgentrification was prevented by rent control. To the extent that there still are some good independent cafes and lots of good bookstores, and interesting events, Boston/Cambridge is certainly the type of place you could expect to strike up a conversation about some arcane technical or cultural topic with people you don't already know. This happens on a fairly regular basis. Another thing worth mentioning though is that the Boston/Cambridge area is a lot smaller than people who have not lived here would expect. It is socially small in that you run into people you know all the time, and it doesn't have the anonymity that New York does for that reason as well. Geographically it is also very small. As pg says, MIT and Harvard are adjacent, this is true (literally a short 5-10 minute walk along the Charles River), but consider also that my typical bike ride from Jamaica Plain to Cambridge is only 15-20 minutes. And Jamaica Plain is a southern/western suburb (actually officially part of the city proper), almost as far south as you can go before hitting the shore (Dorchester is further south), while Cambridge is directly North of the heart of Boston. Similarly my western-leaning home of Jamaica Plain is 30 minute ride to the far eastern community of Charlestown. The point of bringing this is up is to note that cultural millieau of Cambridge is present in the whole area, even if strongest in Cambridge. The same kinds of events that happen in Cambridge occur all around the area, which is not surprising considering that everything is so close geographically.