MSNBC Hallie Jackson Reports December 27, 2021 20:07:00
Now? >> there is really two reasons we wear a mask. one is to protect ourselves, and also if we happen to be infected, maybe we dont know it yet, it protects others from our spreading the virus onto others. there is no question that cloth masks do provide ample protection in terms of our spreading the virus onto others. we measure the effectiveness of these masks in terms of how well they filter out tiny particles. those n-95 masks are called n-95s because they filter out about 95% of these tiny...
Source: archive.org