Step into Science with DINOSAUR HUNTERS Less than 200 years ago, nobody knew that dinosaurs had ever existed. Then someone found a bone. A huge bone. A bone so big it could not have come from a hippo or an elephant. What could it belong to? One scientist had a theory. He said that before there were any people, huge reptiles lived on the earth. Today we call them dinosaurs! Here is a fascinating book about fossils and what they can tell us about dinosaurs.