Viruses are just as mysterious as they are dangerous. Even scientists have a hard time understanding exactly what makes them work. From the debate about whether viruses are living or nonliving to the understanding of how exactly they function, there's a lot to learn about viruses. Young scientists will jump right into the fascinating world of the virus through colorful photographs of viruses in action. Detailed depictions show what they look like through a microscope. Illustrated teaching companions help to encourage an understanding of this complex subject while showing how viruses make us sick.