This week, researchers at Umea University in Sweden released a startling finding: Couples in which one partner commutes for longer than 45 minutes are 40 percent likelier to divorce. The Swedes could not say why. Perhaps long-distance commuters tend to be poorer or less educated, both conditions that make divorce more common. Perhaps long transit times exacerbate corrosive marital inequalities, with one partner overburdened by child care and the other overburdened by work. But perhaps the Swedes are just telling us something we all already know, which is that commuting is bad for you. Awful, in fact.