XPost: misc.news.internet.discuss   
   From: here@is.invalid   
      
   No mask is 100% effective. An N95, for example, is named as such   
   because it is at least 95 percent efficient at blocking airborne   
   particles when used properly. But even if a mask has an 80%   
   efficiency, Marr said, it still offers meaningful protection.   
   ...   
   ...   
   Marr said research shows that high-quality masks can block particles   
   that are the same size as those carrying the coronavirus. Masks work,   
   Marr explained, as a filter, not as a sieve. Virus particles must   
   weave around the layers of fibers, and as they do so, they may crash   
   into those fibers and become trapped.   
      
   https://www.cbsnews.com/news/face-mask-effectiveness-what-scienc   
   -knows-now-60-minutes/   
      
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