Gr 6-9-These two titles adapted from the author's Secrets of the Universe: Discovering the Universal Laws of Science (Atheneum, 1987; o.p.) explain the basic principles of matter, thermodynamics, and modern physics. Beginning with Einstein's equation of E=mc2 as the basis of physics, the introduction in both books defines a natural law so that readers may grasp the scientific principles presented. Chapters follow a sequential and logical progression through questions and explanations of everyday occurrences, the discovery of scientific laws, and their relationships to other discoveries in the field. Terms unique to the subject of physics are clearly explained and defined, and some simple experiments provide further understanding of these laws and how they work. Straightforward drawings and diagrams show processes and the structure of elements. The language and sentence structure make an otherwise difficult subject easier to understand through a conversational text. Isaac Newton, Albert Einstein, Werner Heisenberg, and Dmitri Mendeleyev are only a few of the great scientists introduced. A time line of major scientific discoveries and other major American historical events helps in placing these discoveries in historical perspective.-Susan Shaver, Hemingford Public Schools, NE Copyright 2001 Cahners Business Information.