1. Many years ago, during a cholera outbreak in London, a physician plotted the location of cases on a map, getting a plot that looked like Fig. 1. Properly visualized, the data indicated that cases clustered around certain intersections, where there were polluted wells, not only exposing the cause of cholera, but indicating what to do about the problem. Alas, not all data mining is this easy, often because the clusters are in so many dimensions that visualization is very hard.
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