How the Czech Republic is slowing Covid - worth watching.

[totoro]

https://www.youtube.com/watch?v=jZtEX2-n2Hc

And interim guidelines out of the US:

https://www.health.state.mn.us/diseases/coronavirus/hcp/masksalt.pdf

Before you raise objections based on the public health messaging you have received in NA or other countries, you can review all of the links to source studies on the matter at the thread "why aren't more people wearing face masks" including information out of Taiwan and Singapore.