When we blew the first atomic bomb at White Sands near the end of the war, nobody knew what was going to happen. There was a theory that the chain reaction would continue forever. And we would have created a little tiny sun out there in the desert that would burn until the end of the universe. It wasn't a widely held theory but it was a theory that nobody had a way of disproving. There were people who thought it wouldn't go off at all, that it would simply sit out there and melt and produce a great big dirty cloud of radioactivity. Nobody knew.