It’s debatable as to how effective masks truly are against viruses like 2019-nCoV.
from gizmodo http://www.gizmodo.co.uk/2020/01/how-much-do-face-masks-help-prevent-the-spread-of-viruses/
from gizmodo http://www.gizmodo.co.uk/2020/01/how-much-do-face-masks-help-prevent-the-spread-of-viruses/
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