For the moment all you have to know is that two fundamentally different stories have been enacted here during the lifetime of man. One began to be enacted here some two or three million years ago by the people we’ve agreed to call Leavers and is still being enacted by them today, as successfully as ever. The other began to be enacted here some ten or twelve thousand years ago by the people we’ve agreed to call Takers, and is apparently about to end in catastrophe.”