The other day, my 4-year-old son asked me what a border is. It was a simple question, and yet I found myself stammering until his eyes narrowed intently. He does that, as if to say, "Aha, it seems I have stumbled upon something juicy here." He might as well have been asking where babies come from. In fact, I was merely struggling to figure out whether to emphasize that borders are shared, thus bonding either side, or whether to emphasize… more