I feel like public transportation really does tie a city together in ways that certainly weren't part of the suburban community where I grew up. I mean, my kids certainly became independent, both at younger ages, but also in more gradual ways than I was able to as a teenager. You know, having a kid ride two stops on the same subway line to get to the same activity, which is located directly above the escalator, that's something that a lot of kids I think can handle long before you would trust them with a 2000 pound motor vehicle. And so I think both that kind of scaffolded experience for that sort of independence, that does kind of build neural pathways in a sense of knowing where things are. I mean, I remember getting my driver's license and realizing even places that were very close to me, I had no idea, was that North is that South? I know it only takes five minutes, but in which direction and where do I turn? You know, and I think having the metro map overlay, whether it is the bus or the train, can help to kind of give some anchoring points that way. Riding the bus or the metro, most of us don't meet our new lifelong best friend because of somebody that we happen to sit next to. It hadn't occurred to me until you asked this, but my late husband, we actually did meet coming up an escalator from a metro stop. I had done AmeriCorps National Service, I had a tote bag with an AmeriCorps badge. And I'm walking up the escalator and somebody comes up behind me and says, Oh, are you an AmeriCorps member? Because I work for the Corporation for National Service, the federal agency that oversees... it turned out we lived in the same apartment building. My mom always had thought, well, you would have met anyway, because you lived in the same apartment building. But the truth was, our paths really didn't cross, we did laundry at different times, our schedules were very different. And so had I not been walking up the Metro escalator with that particular identifiable symbol at that particular day.... You asking that question makes me wonder if public transportation has played a bigger role in my life than I had acknowledged at any point during the years of working on this book.