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" It's pretty obvious that other masks don't work at all"

So a N95 mask works and covering your mouth with a bandana has no effect at all? Not even 10%?

I was putting on two N95s until someone said three was three times as effective so I started wearing three, then one day I did the math myself and don’tcha know, 95% of 95% of 95% is 86%! So I’m back to one mask now, underneath my motorcycle helmet.

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