SARS-Cov-2 is a novel virus, meaning that humans have never before encountered it. But it is also just one more in a pattern of pathogens that have, at a particular time, moved from the animal kingdom and spread widely among the human population, striking down some and passing over others. Given these facts—that it is new, and it is deadly—it is little wonder that all sorts of explanations are proffered. People do what...
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