Mary Pope Osborne

Introduces the Vikings, discussing why they went on raids, what they wore, what their ships were like, and how they shaped history.

Jack and Annie track down facts about pandas and other endangered species.

Provides information on the pilgrims, including who they were and why they risked everything to travel to a distant land.

Provides information on the life and times of Leonardo da Vinci, who was known as a scientist, artist, and archetypical Renaissance Man.

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...

Track the facts about the great printer, inventor, and Founding Father, Benjamin Franklin!
When Jack and Annie came back from their adventure in Magic Tree House #32: To the Future, Ben Franklin! they had lots of questions. What was Ben Franklin's first job? How did a kite teach him about electricity? What are some of Ben's most famous inventions? Why did he have so many nicknames? Find out the answers to these questions and more...

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 Merlin Mission #16: A Ghost Tale for Christmas Time, they had lots of questions. Why did Charles Dickens write A Christmas...

Track the facts about the Alamo, the Galveston hurricane, and the great state of Texas!
When Jack and Annie came back from their adventure in Magic Tree House #30: Hurricane Heroes in Texas, they had lots of questions. Why is Texas called the Lone Star State? What was the Alamo? When was the Galveston hurricane? Why was it so terrible? Find out the answers to these questions and more as Jack and Annie track the facts about Texas.
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Provides readers with answers to questions regarding the diverse creatures who live in the oceans, with a review of some of the myths regarding sea monsters and the like.

Presents a nonfiction companion book to Stallion by Starlight, discussing the history of domesticating horses and explaining why Alexander the Great's horse was so famous.