When Jack and Annie got back from their adventure in Magic Tree House Merlin Mission #23: High Time for Heroes, they had lots of questions. How did Florence Nightingale change nursing? Who helped women get the vote? What was Martin Luther King, Jr.'s, dream? How did Gandhi change the world? Find out the answers to these questions and more as Jack and Annie track the facts behind six amazing people who have changed history. Includes Florence Nightingale, Martin Luther King, Jr., Gandhi, Harriet Tubman, Susan B. Anthony, and John Muir. 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. And teachers can use Fact Trackers alongside their Magic Tree House fiction companions to meet common core text pairing needs.