A series of twenty non-fiction science readers which engages children in the world around them. What is a fossil? What are minerals and metals? How are mountain

A series of twenty non-fiction science readers which engages children in the world around them. What causes floods? Why do volcanoes erupt? What is the differen

Presents information in the form of illustrations, definitions, and charts that can be used to review key topics related to life science, earth science, space s

The ultimate, comprehensive guide to official country data and statistics, from the world’s most sophisticated intelligence-gathering organization. From Afgha