Cluster Analysis

Gald looked for changes in the phenomena over time. And these tended to be correlated with changes in soc gald writes if inundations of water have been more frequent and the flinging or spreading of excrement less frequent. With modern plumbing, we don't have chamber pots or open cesspits so you wouldn't expect excrement getting thrown around. On the other hand, there have been recent cases where telephones were tossed about. You wouldn't have had that before a certain point in history when telephones came into common use.