Who has the most persuasive data showing masks work to control coronavirus? NOT CREDIBLE: Lab-only tests POSSIBLY CREDIBLE: Comparing locations by mask policies (Watch how many lab-only tests I get anyway.)
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The data does not necessarily reveal the root cause. If we all started wearing blue socks and, coincidentally, the rates went down, would it be the socks? There are other factors (variables) that could/should be considered.
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