One early afternoon about 12 years ago I took three left turns and two right turns along the dense streets of Hanoi, Vietnam — and promptly found myself unutterably lost. I’d arrived for my first-ever visit to the city after a 24-hour journey from my home in Brooklyn late the night before — and as elegant women wearing conical straw hats pedaled past me on bicycles weighted down by flowers and produce, I stood on a street corner there possessed of no phone, no shared language, no context, no map, no prior understanding, no deep wisdom of the culture I’d found myself in, nothing to fall back on. Who knew what might happen next? I was at once a little scared and a whole lot delighted. Now, at 56, “a little scared and a whole lot delighted” is a disposition I’ve developed an unexpected propensity for in these ripe middle years of my life. This propensity is pretty much the dead opposite of what I imagined wanting for my grownup self when I was young …