Could it be because the WHO and CDC spent so much time saying they were worthless and people don’t learn new facts?! 
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I think they didn’t want a shortage of masks for the medical professionals
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I know...it's pretty obvious they do nothing.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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That is no longer in question. So they are necessary. They are not perfect, so also distance and do not stay in a closed space very long at all.
End of conversation
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