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3:35
YouTube
Duke Health
Inexpensive way to test face mask effectiveness in reducing COVID-19 transmission | Duke Health
Dr. Martin Fischer, Ph.D., from Duke University, developed a simple, low-cost technique to visualize the effectiveness of different face coverings on droplet emissions during normal wear. Testing several face coverings, the researchers found that the particles can be blocked by some, but not all recommended face coverings. N95s without valves ...
468.2K views
Aug 7, 2020
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