Magic Tree House Research Guides are now Magic Tree House Fact Trackers! Track the facts with Jack and Annie! When Jack and Annie got back from their adventure in Magic Tree House #1: Dinosaurs Before Dark, they had lots of questions. When did the dinosaurs live? What other animals lived at that time? Which dinosaur was biggest? How do we know about dinosaurs? Find out the answers to these questions and more as Jack and Annie track the facts. Filled with up-to-date information, photos, illustrations, and fun tidbits from Jack and Annie, the Magic Tree House Fact Trackers are the perfect way for kids to find out more about the topics they discovered in their favorite Magic Tree House adventures.