These days, casual, random meetings with people who could be strangers feel more like reunions. There is a sense of warmth and familiarity, mingled with curiosity about the thoughts and happenings that have brought them here, that have changed their expression and colored their hair. And often the feeling goes both ways. We’ve met before, haven’t we? I just can’t quite remember where. It goes unspoken. We have a natural interest in each other. But there is more. We care.