[news]”Face shields and masks with exhalation valves are not effective at preventing COVID-19 transmission, finds a new droplet dispersal study. (Physics of Fluids journal, 1 September 2020)”

https://ift.tt/34UNY3V

https://ift.tt/2CiRS8e Submitted September 02, 2020 at 06:13PM by Eastern_Gate https://ift.tt/2EXMawp