Third grader Emma Taylor is not sure whether she will be a scientist or an engineer one day. In the meantime, she needs help with understanding physics. Her pets, Melvin and Muffin, help her explore Newton's third law so she can finish her school project. This is a delightful story of two pets that help Emma, their human, understand Newton's Third Law of Motion. This is one of the best written books I have read that explains action and reaction. It promotes science inquiry, science literacy and science curiosity. It is factual, standards-based, and grade appropriate. While it is written for 3rd graders, it can be used to introduce, engage and review the laws of motion across elementary grade levels. I loved meeting Muffin and Melvin and can't wait to see their future adventures as they help their human in understanding real-life applications of science. ~Dr. L. Octavia Tripp, Former Middle Grade Science Teacher Grades 4-8Former NASA Urban and Rural Community Enrichment Program (URCEP) Program Coordinator, NASA Headquarters, Washington, DCand currently an Associate Professor of Elementary Science Education at Auburn University