Not all masks are made equally, just ask @masknerd.
— CBS Mornings (@CBSMornings) January 25, 2022
The aerosol scientist breaks down the best masks for filtration, fit and comfort — and how to spot which masks are legitimate. pic.twitter.com/8gqlLewJIP
and more from Aaron Collins:
The Guardian: Aaron Collins on masks for the COVID-19 pandemic.
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