If Your Mask Has a Valve, It's Half Useless 16:23 Vitals Edit If you’re wearing a face mask with a little plastic valve embedded in it, you should know that valves compromise the effectiveness of the mask—and this is true whether your mask is a hardware-store N95 or a designer cloth mask. Read more... Share on Facebook Share on Twitter Share on Google Plus RELATED POSTS It's Time to Cancel Your Thanksgivi...How Will the Government Approve a V...How Bad Is It to Eat the Same Thing...
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