Talking of it works or it doesn't.... there was a Scientist/Professor/Expert, not sure which as I missed the start, he was on about the the disposable masks, (and some of the fabric ones) saying that in reality they are only about 50% effective, if that, as there is a gap each side, which allows anything to get in / out of the mask, he said add that to the many that don't use them properly (1 use, max 3 hours) then he could not really see why we still persist with them, he did not mention the plastic visors, that I think are a complete waste of time long term