Award-winning collaborators Kathleen Weider Zoehfeld and Lucia Washburn will take you on a journey through time to learn about where dinosaurs came from! The year 2010 marks the fiftieth anniversary of the Let’s-Read-and-Find-Out Science series, winner of the American Association for the Advancement of Science/Subaru Prize for Outstanding Science Series. Come face-to-face with the giants that roamed the Earth during the time of dinosaurs and meet their ancestors, way back to the very first single-celled life forms. Stegosaurus had spikes along its back. Triceratops had three long horns on its head. Tyrannosaurus rex was enormous, with razor-sharp teeth. Millions and millions of years before the first people lived, these fascinating creatures ruled the Earth. To find out where they came from, you have to travel back in time...3.5 BILLION years! Come explore the biggest mystery of all where did dinosaurs come from? Read and find out! Kathleen Weidner Zoehfeld, a former LRFO editor and Lucia Washburn brilliantly organize an incredible array of information, making it accessible to very young readers.