1. Why Are the Lessons in This Book Different Than in Other Books? -- 2. How Can You Teach Activity-Based Science Lessons Safely and Efficiently? -- 3. Lessons for Constructing Understanding. Sect. I. Life Science Lessons. Sect. II. Physical Science Lessons. Sect. III. Earth and Space Science Lessons -- App. A. National Science Education Standards: Content Standards for K-4 and 5-8 -- App. B. A NSTA Position Statement: Guidelines for Responsible Use of Animals in the Classroom -- App. C. A NSTA Position Statement: Liability of Teachers for Laboratory Safety and Field Trips