Mask research during COVID-19: Hypothesis - masks work Observation - not inconsistent with masks working Conclusion - masks work QED
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Given that it's a scarce resource I'm surprised there's no trial randomly allocating free masks of different types per zip code or something in the USA.
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Evidence from several US states now is that some combination of masks, closing/restricting bars/restaurants, and people being afraid is pretty effective. TX/AZ/FL were in similar spots and varied in that regard; sometimes different local policies...
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