Researchers created a test to determine which masks are the least effective - CNN
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Schools are reopening, amusement parks are welcoming back visitors, and outdoor dining is the new way to eat out. But despite the signs that life is returning back to normal, the coronavirus pandemic has gone nowhere.
https://www.cnn.com/2020/08/08/us/duke-university-face-mask-test-trnd/index.html
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Cnn
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