Reviewed with Lisa Trumbauer's All about Light .PreS-Gr. 1. Light is a form of energy. Energy makes things happen. In the simplest words, these two titles in the Rookie Read-About Science--Physical Science series admirably explain fundamental concepts for the very young. The familiar layout will invite emerging readers. Color photos and just a few sentences in bold type appear on spacious, white pages, and the books themselves are small, square, and easily handled. But it's the surprisingly substantive texts, which draw examples straight from a child's world, that really distinguish these titles. To illustrate the concept of vibration, for example, Sound encourages children to touch their throats while singing. Both titles summarize key facts in basic language without condescension: Light makes shadows. Light makes color. For individual reading or classroom sharing, these are a great springboard for children questioning the whys of the world. A final illustrated spread in each book summarizes new vocabulary.