How big was Tyrannosaurus rex? How many teeth did it have? Learn the answers and more in this guide to THE TYRANNOSAURUS REX. Downloadable Teacher Notes available. More →

In the 1800s, the Underground Railroad was a system of secret routes and safe places to hide for black slaves trying to escape to freedom. This astonishing book details the evidence that led… More →

How do Americans state what they believe in, how their representative government works, and more? By writing it down! Investigate great documents that have shaped United States history,… More →

When war was declared in Europe in 1914, Americans were divided about becoming involved. President Wilson vowed to keep the United States neutral and tried to influence each side in the war… More →

Do you wonder about the vastness of space that surrounds our planet? Do you know what a star is, how it forms, and what makes it shine so brightly? In this book, learn about the universe and… More →

Travel back in time to the big bang, and learn about the formation of the universe. Explore the baffling world of black holes, and find out how scientists are searching for alien life.… More →

The Ural Mountains form a natural boundary called the "Stone Belt" between Europe and Asia. Rich in mineral deposits, the Urals have long been a major source of industry for Russia. This… More →

How big was Velociraptor? Could it run fast? Learn the answers and more in this guide to THE VELOCIRAPTOR. Downloadable Teacher Notes available. More →

Elaborate design was the hallmark of The Victorian Home during the Victorian era in North America. Full-color photos show why houses of this period were often called "painted ladies" due to… More →

As the Soviet Union attempted to expand the influence of communism around the world, the United States responded with a policy called "containment" to prevent it. The war in Vietnam was a… More →