I need to write about this, if only to get it off my chest.  There was a piece on Nightly News recently – actually, it aired on February 16 and has haunted me ever since.  How do you know, Brian Williams asked, when the time comes to take the car keys away from elderly parents?  Dr. Nancy Snyderman was the medical expert here, and she sited statistics on the number of auto accidents among elderly drivers.  She also talked about why this happens – slow response, confusion, deteriorating spacial judgment, and so on.  The focus of her piece, though, was an interview with a 94-year-old man who had made the decision, with his family’s approval, to limit his driving to daylight and his own neighborhood.