Still Confused About Masks? Here’s the Science Behind How ...
Español | русский | 中文. Editor's Note: This story was updated on July 11 to include information on why valved masks do not block exhaled droplets. As states reopen from stay-at-home orders, many, including California, are now requiring people to wear face coverings in most public spaces to reduce the spread of COVID-19.. Both the Centers for Disease Control and Prevention (CDC) and ...