Study after study has come back at best inconclusive, and at worst showing that they don't work. Those that don't meet these conclusions have some serious flaws in the method
School Masks DON'T WORK
School Masks DON'T WORK
School Masks DON'T WORK
Study after study has come back at best inconclusive, and at worst showing that they don't work. Those that don't meet these conclusions have some serious flaws in the method