Homemade cloth face masks likely need a minimum of two layers, and preferably three, to prevent the dispersal of viral droplets from the nose and mouth, a video case study indicates. https://cnn.it/32Qes5K | CNN
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Homemade cloth face masks likely need a minimum of two layers, and preferably three, to prevent the dispersal of viral droplets from the nose and mouth, a video case study indicates. https://cnn.it/32Qes5K | CNN
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