The past few months have shown how difficult—and how important—it is to be able to understand how a disease really works. Scientists and researchers at the front lines of the  pandemic are rapidly learning everything they can about the novel coronavirus: how it functions, how different cells in the body react to it, and why those interactions provoke such a wide range of responses in different people. All of this is critical to unlocking new therapies: the better we can understand a disease, the better we can treat it.Â
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