In 1994, Carl Sagan said of the picture above, "To my mind, there is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly and compassionately with one another and to preserve and cherish that pale blue dot, the only home we've ever known."  Here we are, a quarter of a century later, and Sagan's words are more pertinent than ever....