Gr 4-7-These books move beyond basic introductory texts and provide questions as well as answers to some of the complex aspects of each of these topics. An explanation of a concept is followed by at least one simple experiment or demonstration (usually no more than four or five steps). Needed supplies (inexpensive household objects) are noted in a boxed sidebar with a description of what principles are at work. Photographs illustrate each step. In the first book, Farndon defines color; points out that ours is a three-color world; and discusses mixing, changing, contrasting, and shimmering colors. Activities include how to make a spectrum, how to mix colored light, and how to create a color wheel. In the next book, the author turns his attention to electricity, discussing charges, circuits, conductors, and insulators. Activities include creating a Xerox effect and making an electroscope. The last book looks at the role of the Sun, winds and how they blow, tornadoes and hurricanes, clouds and humidity, and rain and storms. How-to experiments include making a sundial, a mobile, a vortex, and a wet and dry hygrometer. Good resources for reports and for those who want to know how and why things work.-Edith Ching, St. Albans School, Mt. St. Alban, Washington, DC Copyright 2001 Cahners Business Information.