Book excerpt: This remarkable evolution series, narrated by the Universe itself, concludes with Book 3, the amazing story of mammals. It picks up with the extinction of dinosaurs, and tells how tiny mammals survived and morphed into lots of new Earthlings . . . horses, whales and a kind of mammal with a powerful imagination-you. It's a story of chaos, creativity and heroes-the greatest adventure on Earth! And it's a personal story . . . about our bodies, our minds, our spirits. It's our story.