home
products
support
blog
about
login
Group Email Manager
login
signup
Home
nfu@simplelists.com
New study from U. Waterloo finds cloth masks 10% effective against COVID, N95 masks 46% effective (against aerosol droplets)
Archive index
By thread
By date
New study from U. Waterloo finds cloth masks 10% effective against COVID, N95 masks 46% effective (against aerosol droplets)
Mark Crispin Miller
24 Aug 2021 21:54 EDT