Explore the fascinating world of the human immune system with 'Let's Play Defense!' Designed for grades 6-8, this enlightening book delves into the body's complex defense mechanisms, from the skin's barrier to the targeted attacks of T and B cells. It breaks down passive and active immunity, explaining how vaccines train our bodies to fight off invaders. Essential for school teachers, homeschooling parents, and librarians, this guide underscores the importance of immunity in our STEM curriculum.