Many people know the dangers of coming in contact with different types of bacteria, but what they may not be familiar with are the good types of bacteria. This accessible text explains the various types of good and bad bacteria and their value to different ecosystems. Readers will deepen their understanding of these organisms after seeing what they look like under a microscope. Informative fact boxes and bright, full-color photographs presented as part of an engaging design add extra insight into this interesting science curriculum topic, and help make learning about science fun.