The 3 Most Effective — and 2 Least Helpful — Face Masks

Wearing a face mask might be among the best ways to prevent the spread of the coronavirus. But some types of masks are significantly more protective than others. It's not the usual blah, blah, blah. Click here to sign up for our free newsletter. Recently, Duke University put more than a dozen types of masks through their paces. To test the masks, researchers used a setup that included a box…

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