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Infectious diseases require a certain critical mass of people to become endemic in a population. Smaller than that, and they burn themselves out by making every susceptible person either immune or dead. The smaller and more isolated the population, the more quickly this happens. Based on what I'm seeing in Epidemics and Pandemics: Their Impacts on Human ...


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It looks like they were in fact in use as late as the 17th century by rural folk, although there is some doubt as to how ancient at least some of those runes were. The more practical ones seem to center on fishing and herding activities, which indicates the kind of people who were using them. Since the finds are in relatively recent books, you could argue ...



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