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The example, though, was about (hypothetical) people who did not know whether or not certain diseases were contagious, or how to contain them if so. Whereas today we are working with somewhat more of an idea of how diseases work and whether or not they are contagious and if so in what ways, than in the hypothetical prehistoric example. (Not saying that some people in "prehistory" may not have had just as much, or more, advanced knowledge about diseases and medicines than we do today - but referring to the example Ayinde gave.)
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