Invisible Allies: Microbes That Shape Our Lives - Hardcover

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Starred Review. Grade 6 Up–While Farrell's Invisible Enemies (Farrar, 1998) presented the struggle against disease-causing microbes, this lively and engaging companion offers intriguing insight into those that play a more helpful role in shaping our lives. The variety necessary for human survival is simply astonishing, and the author presents many of them in captivating detail. The book begins with a brief introduction to and history of these organisms. Chapters are devoted to the historical importance of food preservation and the use of microbes in producingcheese, bread, and chocolate. Information on the microbes necessary to digest such a meal and then to decompose it is included. The final chapter provides an exhaustive description of a waste-treatment plant. Complementary black-and-white photographs and illustrations are included throughout the text. This is a fascinating read, as well as a source of useful information for reports.–Maren Ostergard, Bellevue Regional Library, WA
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*Starred Review* Gr. 6-9. The author of Invisible Enemies (1998), Farrell now offers a fascinating, broad-ranging and imminently readable book on the beneficial roles of microbes. After stating some amazing facts about microbes and advising readers against "running, somewhat futilely, for a bar of soap," the introduction provides a vivid picture of Antony van Leeuwenhoek's discovery of microorganisms in 1676. The chapters that follow consider beneficial microbes in the production of bread, cheese, and chocolate as well as their vital role in the gut, where they break down certain foods, kill harmful microbes, and enable certain genes in the intestines to maximize digestion. Finally, Farrell explains the process by which microbes dispose of human waste in sewage treatment plants, noting that they are also used to clean up oil spills and toxins in the environments. Illustrations include photos as well as interesting archival material. Without talking down to her audience or hyping the grosser aspects of the subject, Farrell presents what is known about beneficial microbes and acknowledges the ongoing study of these amazing life-forms. Carolyn Phelan
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