WILL OSBORNE and MARY POPE OSBORNE have been married for a number of years and live in northwestern Connecticut with their three dogs, Joey, Mr. Bezo, and Little Bear.

Mary is the author of over one hundred books for children, including novels, picture books, biographies, and retellings of fairy tales and world mythologies. Will has worked for many years in the theater as an actor, director, and playwright. Together he and Mary have coauthored two books of Greek mythology and eight Magic Tree House® Fact Trackers. Will has also written a multimedia planetarium show, Magic Tree House Space Mission, and is cocreator with Randy Courts of Magic Tree House: The Musical, a full-scale Broadway-style family musical based on Christmas in Camelot.

SAL MURDOCCA has illustrated more than 200 children's trade and text books. He is also a librettist for children's opera, a video artist, an avid runner, hiker, and bicyclist, and a teacher of children's illustration at the Parsons School of Design. Sal lives and works in New York with his wife, Nancy.

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fiction has never looked better. Track the facts with Jack and Annie!!

When Jack and Annie got back from their adventure in Magic Tree House #5: Afternoon on the Amazon, they had lots of questions. How much rain falls in a rain forest? What is the world's heaviest insect? What the heck is a sausage tree? Why is it important to preserve the world's rain forests? 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. And teachers can use Fact Trackers alongside their Magic Tree House fiction companions to meet common core text pairing needs.
Did you know that there's a Magic Tree House book for every kid?
Magic Tree House: Adventures with Jack and Annie, perfect for readers who are just beginning chapter books
Merlin Missions: More challenging adventures for the experienced reader
Super Edition: A longer and more dangerous adventure
Fact Trackers: Nonfiction companions to your favorite Magic Tree House adventures
Have more fun with Jack and Annie at MagicTreeHouse.com!