Hundreds of epidemiologists from around the world (WHO) asserting that people can contract SARS-CoV-2 infection from airborne virions -- free virus particles floating in the air, as distinct from aerosol droplets. In this exclusive 鶹ý video, David Aronoff, MD, of Vanderbilt University Medical Center in Nashville, reviews what we know about COVID-19 transmission dynamics, and what types of research could help pinpoint the spread of the virus in the future.