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Research Article (DUKE): Low-cost measurement of facemask efficacy for filtering expelled droplets during speech

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The Duke University physics department tested the effectiveness of masks and face coverings at stopping the spread of the COVID-19 coronavirus and found that fleece gaiters can make the spread worse than no mask at all.

Dr. Eric Westman was helping a Durham nonprofit organization provide free masks to people who need them when he decided he should find out whether the masks would really prevent the spread of coronavirus.

But it wasn’t simply a matter of searching online to see which masks worked best. This was April, and at that time researchers hadn’t tested the variety of home-made masks and improvised face coverings that most people are wearing now, Westman said.

Research Article
Low-cost measurement of facemask efficacy for filtering expelled droplets during speech

DOI: 10.1126/sciadv.abd3083

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