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Do Face Masks and Coverings Reduce the Spread of COVID-19?

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One Mask Is Good. Would Two Be Better? (From the New York Times)
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Community Use of Cloth Masks to Control the Spread of SARS-CoV-2
images from a research study of a mannequin wearing a face mask and particles escaping
Face Shields and Valved Masks Don't Fully Stop the Spread of Aerosols