This issue of Exploratorium Magazine focuses on microbes. Different types of microorganisms are introduced based on their living environments or whether they are harmful or beneficial. Contents include: (1) "It's a Small World" (Blake Edgar); (2) "The Human Body: A Complex Ecosystem" (Nik Walter); (3) "The Hills That Bacteria Built" (Robert Evans); (4) "Try This!N-Flavorful Fermentation: Kimchee" (Karen E. Kalumuck); (5) "Germ Warfare on the Home Front" (Ellen Klager); (6) "Fragments" (Carolyn Strange); (7) "Sex and the Single Microbe" (Eric Engles); (8) "Getting Microbes to Do Our Dirty Work" (Carol Blaney); (9) "Try This!N-Bacterial Terrarium" (Fred Stein); (10) "The Domestic Yeast" (Alice Cascorbi); and (11) "Ask Us" (Mary K. Miller). (YDS)