When my spouse Leonard was young, his mother told him a joke about President Richard Nixon: Nixon fell into the Potomac River and was in danger of drowning. A local kid jumped in to save him. Nixon, grateful, said, "Is there anything I can do for you? A tour of the White House? An official commendation?" The kid said: "When I die, can you make sure I get buried in Arlington National Cemetery?" Nixon said: "I think so, but why is that on your mind? You have your whole life ahead of you!" The kid ...