The Open Door Web Site http://www.knockonthedoor.com
A Natural Science reference site for middle school students. Includes topic chapters, facts and figures, questions and quizzes. Quick search and index search available, as well as an Internet guide.
Thousand Eyes https://www.thousandeyes.ca:447/english_en/index.php
A volunteer project that observes and records natural history events such as plants flowering, birds returning, frogs peeping, and weather events. Offers a field guide, graphs, maps, and reasons for the project.