ABC News-

As over 20 million across the globe have been diagnosed with COVID-19, scientists from Duke University took a look at face masks to see which ones work best in slowing the spread of coronavirus.

In their study, they looked at 14 masks including N-95s, N-95s with valves, and surgical masks to see how effective each was in keeping droplets from getting out.

“It was mainly focused on the technique, a simple technique to visualize these droplet emissions and the effects of masks,” said Dr. Martin Fisher, an associate research professor from Duke University.

Find out the results on ABC News.

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