This program models the spread of a rumor. The rumor is spread by people who know the rumor telling only those people who are their nearest neighbors. The simulation keeps track of how many people know the rumor, where the people who know the rumor are located, and how many "repeated tellings" of the rumor occur.
For detailed instructions on using the program, take a look at the info window from the Rumor Mill model.
Click on one of the pictures to see a quicktime movie of the model: