Forces and motion are key concepts in the elementary science curriculum. How Simple Machines Work uses easy-to-read text and full-color photographs to help young readers understand the principles behi
Traces the changes in the way Americans have dressed from colonial times to the present, and describes the technological and social developments behind these differences.
Correlated to the early social studies curriculum, this series looks at one aspect of daily life and how it has changed through different periods of American history. The simple, authentic Spanish te
