How Do I Build A Marriage To Last A Very, Very Long Time?

It used to be that life was so brutally short that we didn't have time for a divorce. Dying at 31 from a cougar bite, didn't give a person much time to get bored. But things are different now. Cougars are hardly the thread they once were and we wash out hands more often. Now that a typical lifespan can blow right past the "what do you do now?" phase of a relationship, it's up to us to keep the thing healthy, happy and all that jazz. But how!?! Helen Fisher and our panel of experts have some uncommon wisdom that should get you there.