When Jack and Annie got back from their adventure in Magic Tree House #52- Soccer on Sunday , they had lots of questions. How did soccer get started? Who are some of its greatest players? What is the World Cup? Find out the answers to these questions and more as Jack and Annie track the facts behind one of the world's most popular sports. 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.