Why the best material for a homemade coronavirus face mask is hard to identify

 "The internet is exploding with mask-sewing patterns and advice on which materials are best to use, but many unanswered questions remain about how exactly SARS-CoV-2 spreads and what benefit widespread wearing of nonmedical masks may offer individuals and the public. Because of the inherent variability in household materials, mask design, and mask-wearing behavior, experts caution that the practice is no replacement for social distancing." Read more here.