My dad wasn't one for sad stories, or tragedies. He liked things that he'd call "upbeat." So how is this "upbeat," Dad? How do you explain this one? You have a healthy 61-year-old man, a guy who swims 1 1/4 miles and bikes for another 45 minutes every day; a man whose diet consists of fish, zucchinis, raisins, Cheerios and bagels (lots of bagels); someone who saves and saves for retirement, only to discover that he's terminally ill and is never going to get the chance to use it. By