Coronavirus FAQs: Are 3 Masks Better Than 1? Will Mouthwash Keep You Safe?
NPR - 11/04/2020
As correspondent Maria Godoy reported: Researchers at Northeastern University added an outer layer made from nylon stockings to a homemade face covering. They found that the nylon layer can boost a mask’s ability to filter out small particles in the air by creating a tighter seal between the mask and the wearer’s face.