How Effective Is the Mask You’re Wearing? You May Know Soon
More than 100,000 varieties of face masks are currently for sale. They come in silk, cotton and synthetics; with filters and without; over-the-head and over-the-ears. They have sparkles and sunflowers; friendly greetings and insults; cartoon characters and teeny reindeer. What they don’t have is a label that shows how well they block infectious particles, an…
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