Description For many people, the word "bacteria" evokes thoughts of harmful germs and illness. While it's true bacteria can often be responsible for getting a person sick, they can also be very helpful. Readers of this innovative book will learn about the good and the bad sides of bacteria, and why humans and other animals would never be able to thrive without them. Key topics are presented using concise text paired with colorful photographs, helping readers of many levels to understand important life science concepts.