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This location takes a famous concept from geology of using a spiral timeline to illustrate the history of the Earth. As you walk through the interactive exhibit you get a sense of the passage of time as well as the slow and gradual evolution of life on Earth. I really like the idea of walking through a timeline and interacting with exhibits and can see how this would work with a class. There are many opportunities for discussion and demonstrations along the way. I also think this type of collaborative site would make a really great class project. Constructed by students at the University of Arizona.