Book excerpt: Dinosaurs are extinct now, but you can visit dinosaur skeletons in a museum. There you will meet Brachiosaurus, Stegosaurus, and Diplodocus and learn how they ruled the earth millions of years ago. You'll see dinosaurs with over 1,000 teeth, dinosaurs who could swim, meat-eaters and plant-eaters. And, of course, you'll meet the king of all dinosaurs, the gigantic Tyrannosaurus rex.