The truth about masks

How do masks fight COVID-19?
The mouth and nose are usually where the coronavirus first sets up camp, and also serve as the portals for spreading the virus to new hosts. The saliva of infected people teems with virus particles, which are emitted in droplets when they cough or sneeze. Smaller drops, called aerosols, are launched when a person speaks or even just breathes. Larger droplets are thought to be the primary means of transmission and can be propelled six or more feet before gravity pulls them down to...