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The best way to read this book is to start with Chapter 3, and then Chapters 2 and 3 in order. Chapter 3 is a story about 2 children who have to deal with smoky air that has changed their plans for the day. The family is involved together to learn more about the air. An experiment is provided to show that our air is indeed a substance with qualities to be learned. The other chapters contain extended information on what is air; of what is it made, who and what uses air; how does it support l...