Here's the Science As to Why Masks Aren't Very Effective for COVID-19, The Particles are Too Small to be Trapped by the Mask Dr. Scott Jensen: "An N-95 mask filters out particulate matter larger than .3 microns. So the question then is how big is a COVID particle. A COVID particle is about .1 micron....this idea of people doing anything particularly useful w...a mask is just LOONEY TUNES."  Scroll down for video below: https://twitter.com/i/status/1273924949162340353 Here's a demonstration of how vapor escapes a cloth mask (like the one worn by Biden) https://twitter.com/BarbaraRedgate/status/1294051756624580609