A few years ago, as I was planning a yearlong sabbatical in Europe, it occurred to me to wonder: Just what exactly do people do when they're traveling? Sure, there's sightseeing, museums, walking tours. But what else? How do they spend all the hours?
Once my trip started, I quickly realized what they do: They think. They muse, they ponder, they let their minds wander through tangled back alleys of thought like a tourist lost amid the cobbled streets of a medieval city center. But there can&