You have twin cities situation going on here. Although it is more akin to a left brain-right brain situation. 2 similar structures separated by one physical di

You have twin cities situation going on here. Although it is more akin to a left brain-right brain situation. 2 similar structures separated by one physical divide. It helps to think of Boston and Cambridge as one city. (Though I am sure many don't like that) The city of Boston itself is pretty small to begin with anyways.