Available in print and online.  This is a comprehensive and interactive study guide. Each chapter includes: “Before You Read,” with a brief chapter summary and chapter learning objectives; “As You Read,” a collection of demonstrations, activities, and exercises; “After You Read,” containing three short practice quizzes and one comprehensive practice test; “When You Have Finished,” with Web links for further information and crossword puzzles using key terms from the text. An appendix includes answers to all practice tests and crossword puzzles.