they are no more than placebos and (more importantly to the Left) virtue signals.
Also, the general public does not come close to practicing even basic sterile technique, nor should anyone expect them to be able to do so. Doing it with children (as the CDC did with children in this article because of political Teacher's Union demands) is even more absurd.
There is no scientific evidence to support the use of improperly used masks. The links provided by idiots here are either misapplied, misquoted, or trash. I have been saying it from the start, and we all know this now. The same can be said for the Shut Down. If it weren't for Ron DeSantis, we would all still be in a state of at least partial shut down. The public has been led around by political animals who, in my opinion, have betrayed their profession.