"<a href=""https://www.youtube.com/watch?v=oIOGUYOPAsA&amp;t=1h55m40s"">1:55:40</a> shaming around masks? What? pls speak english", btw masks were really important! the glass walls also helped,(reply>), For masks, mostly its the N95s otherwise particles will still get in. Also there is Dr Jimenez from the University of Colorado led a study on plastic barriers, which help the spread as it hinders ventillation of rooms.