The same article says: “This is a very powerful visual tool to raise awareness that a very simple masks, like these homemade cotton masks, do really well to st

The same article says: “This is a very powerful visual tool to raise awareness that a very simple masks, like these homemade cotton masks, do really well to stop the majority of these respiratory droplets,” Fischer told CNN. The study itself tests 14 masks. You're just reinforcing your priors ...