The BioEd Online site, created by the dedicated staff at the Baylor College of Medicine, is a veritable cornucopia of material for science educators. The lesson plans are all classroom tested and high-quality. This particular corner of the site focuses on the world of microorganisms. The site includes lessons, complete with video clips, slideshows, and .pdf files. The offerings here include "Comparing Sizes of Microorganisms," "Observing Different Microbes," and "Microbes and Disease." The videos are quite nice as they offer a brief introduction to each subject, along with suggestions for how to conduct the associated classroom activity. If visitors enjoy these lesson plans, they should explore the other categories under Classroom Lessons, such as Animals, Genetics, and History & Nature of Science.