You can make the argument that homemade masks won't reach those levels of effectiveness because of a lack of a strong seal around the airways. And there have been no real-world case studies of cotton masks protecting people from getting sick.
But there are plenty of arguments to be made that support the idea that if 100% of the population wore a cotton shirt around their face, then the pandemic would be strongly mitigated.
Oh, well you're in luck. I have just the thing for you:
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You can make the argument that homemade masks won't reach those levels of effectiveness because of a lack of a strong seal around the airways. And there have been no real-world case studies of cotton masks protecting people from getting sick.
But there are plenty of arguments to be made that support the idea that if 100% of the population wore a cotton shirt around their face, then the pandemic would be strongly mitigated.