Scientists develop simple approach to visually evaluate mask effectiveness against viral droplets
(World News Science)

WASHINGTON DC: Using inexpensive and widely available tools, scientists have developed a simple approach to visually evaluate how effectively different types of masks prevent the spread of droplets that could contain SARS-CoV-2 virus particles, according to a new study. While the authors noted their work is still in the early stages, and their method has so far only been tested in a small group of people, these preliminary, proof-of-principle findings suggest that professional-grade N95 masks, surgical or polypropylene masks, and handmade cotton...