This is a book that is about three times as long as it should be considering the information and ideas presented. From the beginning it goes off on irrelevant tangents, and is endlessly repetitive. The basic idea is that species that have evolved from each other have closely related genes, but the evolutionary process uses those genes differently in the growth of the embryo. The author proposes that by understanding how the proper genes are turned on and off during the development of the embryo, we could grow a dinosaur from a chicken egg. It is an interesting idea, but what is said about it in a substantial way could be condensed to many fewer pages.