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Here are the five most effective face mask styles according to science

Bad news for people wearing bandannas and fleeces and even worse news for those around them.

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Researchers at Duke University are using a novel method to judge the effectiveness of different styles of face mask.

Using a setup consisting of a box, a laser, a lens, and a cell phone camera, chemist and physicist Martin Fischer was able to devise a system for counting the number of particles expelled from each type of mask as they repeated the phrase, "Stay healthy, people."