Last week someone mentioned a friend who had died last year. I couldn't remember the date, so I had to look up the fact that he had died on April; 15. Later I started thinking about what killed him, ad after thinking of the proximate cause, cancer. The one who mentioned him also mentioned that he was aware of a sore from a tumor several years ago. The had never had anything one about an obvious medical problem. Then I recalled that he used to complain about aging, because he was ...