New York Times - April 2, 2020
Even homemade face coverings provide some protection, especially when many people who have the coronavirus show no symptoms.
The most important new policy the government can implement to contain the spread of Covid-19 is to immediately recommend that everyone wear masks or face-coverings in public — #masksforall.
Health officials have already encouraged people to wear masks if they are showing symptoms of the disease. Particularly since 25 to 50 percent of people with the virus are asymptomatic, it would be best for everyone to be wearing a mask or face-covering... more