In the absence of medical grade personal protective equipment (PPE), many of us have turned to homemade cloth masks to help stop the spread of coronavirus. But increasingly, research has shown that not all masks are created equal, and some are downright ineffective. A new video case study produced by Australian researchers shows that in order for a homemade cloth mask to stop viral transmission, it needs to have at least two layers of fabric. In effect, if your mask has just one layer of fabric, you can safely bet that it simply doesn’t work.
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Exposing the Big Game 