Television's animated Magic School Bus science adventure series, based on the best-selling books by Joanna Cole and Bruce Degen, offers lively, colorful, and kid-friendly education. The Magic School Bus: Inside Ralphie introduces children to the concept of germs, and explains the complexities of the immune system. As the episode begins, Ralphie becomes sick and is unable to attend an important school function. Ms. Frizzle makes a house call and before long, Ralphie's body is hosting an army of bacteria, providing a dramatic science lesson for the entire class. The video is geared for children ages six to 12.