It was one of those good days. I had closed for the day, and the sun had just begun to set. So I decided in obedience to science… and to my wife, to do some brisk walking in the Ridge area. Just for some droplets of sweat to convince my muscles they were good for something, before I headed on the long drive home. I was now on the homestretch back to the hospital. It had been a pleasant walk so far.