Two studies looked at which materials are best for homemade masks. What makes a better face covering to guard against COVID-19 transmission, a T-shirt or a scarf? Is it safe to use a vacuum cleaner ...

N95 respirators, the gold standard of filtration masks, are back in the pandemic spotlight because of the highly contagious Omicron Covid-19 variant. Unlike earlier in the pandemic, N95s are now ...

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