THE PAST IS NEVER DEAD, IT ONLY HIDES Where did it begin? Could it have been just days ago when a piece of advanced electronic equipment disappeared? Or was it in 1945 when a huge aircraft vanished somewhere in Egypt? Or maybe the start was five thousand years ago when a great flood altered the future of an ancient society? Or possibly an event so far in the past that the only witness would have been something not quite man? And how do you pick up a trail, not known to exist? Things do change quite a bit every thousand years or so. You may carefully mark a path through the deep woods, but if...