Though it may not be a hot topic for kids to pick up for casual reading, as a tool to support the curriculum, this book is packed with solid information.  The layout is attractively designed, with plenty of photos and diagrams to support the text, and the text itself is broken up enough into manageable blurbs to keep it from being intimidating.  The concepts contained in this book (different types of energy, different modes of transferring energy, different sources of energy) are ones that I remember being quite confused about clear until I got to college, this book is quite clearly written, giving concrete examples.