Two leafy, affluent North Shore towns, Hamilton and Wenham, are studying the idea of merging. They already share a railroad station, a high school, and a library.

If they decide this is a good idea, what other similar pairs of towns should follow suit? Medford and Malden? Swampscott and Marblehead? Weston and Lincoln? Arlington and Belmont? (Or Watertown and Belmont?)