Effectiveness of Masks

Posted on Jul 02, 2020 by Russell Brooks

Face Masks and Surgical Masks for COVID-19: Manufacturing ...
A microbiologist in Spokane, Washington wanted to measure the effectiveness of a mask, so using a bacteria culture plate,
he coughed, sneezed, talked and sang - once while wearing a mask, and once without.
CLICK HERE to see the results.

 


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