Kimball's Biology Pages (first reviewed in the May 9, 1997 Scout Report) is an online biology textbook created and maintained by Dr. John W. Kimball, a veteran biology educator and retired Harvard professor. Dr. Kimball believes that the hypertext format is especially well suited for biological study because its nodal structure better approximates the relationships between biological subjects than a linearly structured textbook. In addition, a hypertext allows for more timely updates concerning advancements in biology. This hypertext, likely most appropriate for undergraduates and advanced secondary students, addresses a wide range of biology-related topics such as photosynthesis, cells, invertebrates, and human hormones. Topical pages are categorized under broad headings such as Animals, Cancer, Evolution, Immunology, Plant Biology, Diversity of Life, and more. Topics can also be located by using an extensive alphabetized index, or search engine. The website is well organized, and successfully employs diagrams and other images alongside concise text sections.