"We are what we repeatedly do. Excellence, then, is not an act, but a habit." - Will Durant, summarizing what Aristotle had to say on the subject of habits What does it mean to develop good habits? What does it mean - and what are the effects of - having a "bad" habit? Let's start with a more personal perspective: It was decades ago, an unseasonably hot spring day in a high school chemistry class. Along with my fellow students, I was already having trouble concentrating on the droning voice of our dour teacher, Mr. Barkley, when a loud motorcycle came roaring to a stop right outside our window. Eager for distraction, we rushed to the open window and saw a cyclist dressed from head to toe in black leather. He'd stopped to pick up, of all people, a nun in full traditional garb. As she hopped on the back of the motorcycle, and it sped away, we students were amazed and delighted to hear Mr. Barkley sigh and remark in his usual dry monotone, "I guess it's all right as l…