Washington (AFP)
Microdroplets created by speech can remain suspended in the air in an enclosed space for more than 10 minutes, a study published Wednesday showed, underscoring their likely function in spreading COVID-19
Scientists at the National Institute of Diabetes and Digestion and Kidney Illness (NIDDK) had an individual loudly duplicate the expression “Stay healthy” for 25 seconds inside a closed box.
A laser projected into the box brightened dr