if it can prevent charity unisa. if it can p reve nt eve n charity unisa.there is no negative impact on those children who are wearing the mask then it seems like a sensible and necessary step. the effectiveness of different masks was investigated by the university of edinburgh. they're never going to provide a guarantee against infection but in some situations, they do seem but in some situations, they do seem to make a difference stop so, what does the evidence show about—face coverings? well, we know that if someone is infected, maybe without realising, they can pass the virus to anyone nearby, especially if they are somewhere indoors, crowded and with no fresh air. but if that person covers their face, the mask should trap most of the droplets that they would otherwise release, giving some protection to the people around them. and if those people also wear a mask, but should provide a bit ofa wear a mask, but should provide a bit of a barrier against infection. so, if masks are to be worn in crowded school corridors, why not classrooms as well? when gov