Bill's knowledge on the subject of germs is positively contagious! Using foam models, the Science Guy illustrates the various types of germs and how they function. The recurring character "Mama Crust" motivates kids to brush their teeth, and wash their hands. The DVD has extra features: fully indexed "chapters" correlated to national science standards, interactive glossaries and quizzes, bonus footage of never-before-seen segments, interviews and demos, Spanish translation, and on-disk implementation guide. .