Track the facts about the famous sled dog race and other incredible feats with Jack and Annie! When Jack and Annie came back from their adventure in Magic Tree House #54, they had lots of questions. How do sled dogs race for so long? When was the first Iditarod? What are some other extreme sports? Find out the answers to these questions and more as Jack and Annie track the facts about the Iditarod, open water swimming, the Ironman triathlon, free climbing, the X Games, and other ways people test their limits. Filled with up-to-date information, photographs, 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 discover in their favorite Magic Tree House adventures. And teachers can use the Fact Trackers alongside their Magic Tree House fiction companions to meet Common Core text pairing needs. Have more fun with Jack and Annie on the Magic Tree House website at MagicTreeHouse.com!"

Author Biography

MARY POPE OSBORNE and NATALIE POPE BOYCE are sisters who grew up on army posts all over the world. They work together on Magic Tree House(r) Fact Tracker books to give readers information about the places, time periods, and animals that Jack and Annie discover in their Magic Tree House adventures. Mary lives in northwest Connecticut. Natalie makes her home nearby in the Berkshire Hills of Massachusetts. Mary is the author of all the Magic Tree House(r) fiction titles, as well as many more books for kids. For more information, visit the Magic Tree House(r) website at MagicTreeHouse.co