Gr 3-5 Dinosaur lovers are going to adore this book! Readers are expertly taken through the Smithsonian National Museum of Natural History's new Deep Time Hall. The story begins with the earliest signs of life on Earth more than 4.5 billion years ago. Edgar discusses in detail the creatures that evolved throughout each of the eras, from trilobites to Tyrannosaurus rex to woolly mammoths. Each spread contains an image of a mural from the Deep Time Hall with general information about the animals or time period on one side, and photos of fossils on the other. There is a lot of material in this book, and readers who enjoy dinosaurs are going to appreciate the fascinating facts and photographs. It may not work well for research as there is no table of contents or index. Young researchers will have to skim the book if they are looking for specific items. However, the top corner of each page does contain the time period, providing historical context for the pages. VERDICT Get this book for dinosaur lovers; it reads like a visit to the museum. V. Lynn Christiansen, Wiley International Studies Magnet Elementary School, Raleigh, NC