There is Brown U. study that indicates IQ's of infants are lowered because of mask use of those around them. Masks may not lower IQ's of school age children, but they certainly impede communication. That in turns affects learning. Of course, teachers ignore science and go for propaganda. There is no evidence that children will become seriously ill from COVID. Teachers want the dumbing down of America. It absolute BS.
Maybe the kids can start saying “WHAT”,en masse, when teachers start talking through a mask. You can’t understand what anybody is saying through a mask. Everything comes out like a train conductor announcing trains and stations.