High speed camera captures how different types of face masks work

"Which mask works best? To visualise droplets and aerosols, UNSW researchers used LED lighting system & a high-speed camera, filming people coughing and sneezing in different scenarios — using no mask, 2 different types of cloth masks, and a surgical mask..." (see more)"

See also, "Scientific Brief: Community Use of Cloth Masks to Control the Spread of SARS-CoV-2" from the Centers for Disease Control, 11/10/20.