Today, any kid can rattle off the names of dozens of dinosaurs. But it took centuries of scientific effort--and a lot of luck--to discover and establish the diversity of dinosaur species we now know. How did we learn that Triceratops had three horns? Why don't many paleontologists consider Brontosaurus a valid species? What convinced scientists that modern birds are relatives of ancient Velociraptor? In The Story of the Dinosaurs in 25 Discoveries,...