Clinical microbiologist shows stark visual evidence of effectiveness of masks

Clinical microbiologist Rich Davis has conducted some simple but very persuasive experiments by talking, singing, coughing and sneezing in to agar culture plates with and without a mask over his nose and mouth. 

As you would expect, the resulting visuals are persuasively disgusting, and unequivocally demonstrate that masks block virtually all respiratory droplets. 

See his twitter feed here. 

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