For months, scientists have been saying masks reduce transmission of COVID-19. They now think masks can also make the illness less severe. The reason is the barrier created by a mask likely limits the ...

With the delta variant surging and health officials urging indoor mask use — and requiring masks indoors for many Bay Area locations — you've likely pulled out ...

Paper towels, coffee filters, cloth and other materials can be used for homemade coronavirus face masks during the pandemic. But which are most effective? A study of homemade face masks by ...

01/28/21 Update: This article describes the benefits of filtration in homemade masks, which are similar to the protection afforded by the surging practice of double-masking. You can read more here.