This is a Gopher connection. Exploranet is the World Wide Web component of San Francisco's famous Exploratorium. Sea World has created an online animal information database for use by students. Windows from the Universe comes to us from the University of Michigan. If the topic is flight or even ballooning, it is probably covered at this site.
Topics range from weapons to engines and from early flights to space travel.
This site is well organized and rich graghically. Biology Biology Hypertextbook Chapters this biology site might have content that is beyond many high school students, but the potential is exciting. The technology is hypertext, and as the content is tuned up over time the material contains a lot of potential for independent study. For the lighter side of frogs visit Yale's froggy page . Environmental Education Link is a fantastic site that is very organized and offers high quality information about the environment.