My apologies to my FMF friends. I only had four lessons typed up at the end of my five minutes, but I kept on writing.  I won’t deny that I like unusual challenges and have a quirky sense of humor. So you won’t wonder at one of my choices for ‘fifty fun things to do in my fiftieth year’—run a marathon. I expect the majority of the population wouldn’t classify running for 26.2 miles as ‘fun.’ After completing my first…