Why We Need to Upgrade Our Face Masks–and Where to Get Them – Scientific American

November 29, 2021

Why We Need to Upgrade Our Face Masks–and Where to Get Them – Scientific American:

A wealth of evidence has shown that wearing a face mask helps prevent people from spreading the virus that causes COVID, SARS-CoV-2, to others and from becoming sick themselves. But there has been less guidance from public health officials on what kind of masks provide the best protection.

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