The desire to know our individual destinies has been linked, through the centuries, with our desire to foretell what will happen to humanity as a whole, to comprehend in all its complexity the grand sweep of history. Religious writings, in particular, have offered us interpretations of the history of the Universe, and have been explored for obscure prophecies. Highly imaginative accounts of the beginning of the Universe, of the Earth, and of human beings are often matched by equally imaginative accounts of the final days. We, of the western tradition, are most familiar with the biblical writings in this connection. Some of the prophetic books of the Bible present the future in idealistically happy fashion. Thus, the prophet Isaiah foresees a time when war will end, when there will be no more disputes among nations, when all the world will agree on a single true religion (Isaiahs, of course), and when predatory animals will no longer devour other animals but will eat only vegetation. (It was not understood in Isaiahs time that plants are living creatures just as animals are, and that when they are eaten, they are killed.)