Why is the sky blue? How do astronauts breathe in space? What is a lunar eclipse? The Do You Know?™ books provide an in-depth look at a wide range of popular subjects. Appealing to children who want to know everything, each thought-provoking book features:

• 80 pages of informative content and answers to many popular questions
• Hundreds of labeled, full-color illustrations
• An index to key terms
• And a "More to Know" section that motivates children to explore further