How Scientists Test Face Mask Effectiveness Against Coronavirus | NBC Nightly News

Scientists around the world have conducted research that finds wearing face masks can significantly decrease the spread of the coronavirus by blocking droplets created when a person coughs, sneezes, or talks that would carry the virus.» Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC
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How Scientists Test Face Mask Effectiveness Against Coronavirus | NBC Nightly News

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