This story is science fiction. The authors wrote it to demonstrate the thesis of a real possibility; to wit, that if there were one worldwide enemy all people would unite to fight the one enemy. Of course a little reflection brings the conclusion that in as much as we are armed against each other with nuclear bombs we are in an inverse way our own enemy. Thus we can take from ourselves what is most dear to us - survival. Ideas and emotions of separateness and greed creates a struggle for all of us. "Please do not be alarmed. We come as friends to ask a favor of you. We hope you can see why...