Mask Test
Scientists identify the best (and worst) Covid-19 masks
Laser beam experiments reveal masks that are nearly perfect, and one that raises concerns.
by Emma Betuel
Mask wearing is an essential part of controlling the spread of coronavirus.
New research shows that some masks are far more effective than others.
Kilito Chan/Getty Images
Scientists at Duke University put 14 common masks through their paces...
Brown University/Giphy
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