This Level 1 book, reillustrated with O'Brien's clever, eye-catching illustrations, tells students how to discover the air that's all around them. Full color. When it's not windy, it can be easy to forget about air. But air is everywhere-it fills your house, your car, and even your empty milk glass. In fact, a regular room holds about 75 pounds of it This Level 1 book, reillustrated with John O'Brien's clever, eye-catching illustrations, tells you how to discover the air that's all around you.