This is a fascinating book on the  seemingly disgusting microorganisms that keep our bodies healthy.  About 3 pounds of bacteria cover our bodies inside and out.  Their presence helps keep our skin healthy, aids in food digestion, consume dead material, is used to make medicine and make food tasty, as well as providing oxygen for us to breathe.  The text is well written at about a fifth grade reading level and is filled with intriguing facts.  Colorful, magnified photographs of a variety of microorganisms illustrate this engrossing book.  The glossary includes pronunciation as well as the definition of 10 words.  Also included are a list of resources, an Internet link, and an index.  Books in this series will appeal to reluctant readers who like science.  Other titles in the series are: “Bat Spit, Maggots, and Other Amazing Medical Wonders”, “Farts, Vomit, and Other Functions that Help Your Body”, and “Onion Juice, Poop, and Other Surprising Sources of Alternative Energy”.  The titles alone will draw an audience – especially boys!