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This DIY mask test kit finds that your neck fleece isn’t really helping

This may be of some interest.

Scientists developing a tool to help mask manufacturers make sure their cloth masks actually work found some masks work better than others, and one kind works particularly badly.

If you buy a cloth mask online—whether from Amazon or Etsy or a large manufacturer such as Adidas—you’ll see a warning reminding you that what you’re buying isn’t medical grade. And while the evidence continues to mount that cloth face masks work, it’s also true that every mask isn’t equally effective, and many companies now making masks are doing it for the first time. In the absence of regulation for cloth masks, as shortages of more proven N95 masks continue, how can consumers or the manufacturers making masks know how much protection they offer?

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