Morris begins by discussing the various ideas about the ultimate destiny of the universe: whether it will continue expanding or eventually collapse. Next he addresses the search for a unified theory of matter that will encompass the four known forces in nature: gravity, electromagnetism, and the strong and weak nuclear forces. Finally, Morris looks at the origin of life. Once conditions were hospitable, life evolved on Earth almost immediately. But how? This is the subject of a number of theories the book outlines.