The book goes over the potential of how to make a dinosaur in this day and age and the theory of how to do so. The entire first portion of the book is a recount of the history of dinosaurs and their evolution thereof. The second part of the book pertains to gene manipulation concerning drugs versus master genes using chickens as a base genome example. The last portion of the book goes over the concise Evolution from bird to mammal and explores the theory of reversing evolution. A great read if you can follow it. There is a lot of scientific verbiage that would be difficult for the layman do you understand. Very interesting theories and very entertaining overviews. Jack Horner takes you in depth in seeing just how close we are to creating the Chickenosaurus.