How masks might slow the spread of COVID 19, Science News

Mask wearing has become controversial in the United States, even as data are amassing that masks may help limit spread of the coronavirus. Not much has been known about the effectiveness of cloth masks, so a researcher set up a home lab to test whether these masks can reduce the amount of potentially virusladen material people expel from their mouths and noses. See what he discovered. Read more: CREDITS Story Tina H