The Time Machine at the Department of Geological Sciences at the University of Kentucky is a web site that can be used as a classroom exercise. The site is interactive, in that it lets students create their own web page about any creature or period in earth history, and then view it on the Web. This is a very fun and creative classroom exercise. Completed pages can also be sent to the Department's Webmaster for permanent posting in the Time Machine so that everyone can share in the student's creativity and understanding of Earth history. If you want to access this activity and see what other students have done as a classroom activity click here.