The emergence of COVID-19 started scientists on a yearlong crash course to learn how the coronavirus might travel through the air and how to stop it. They learned a lot, and quickly.
The Centers for Disease Control and Prevention last week said that COVID-19 spreads "most commonly" through air — then took it back. Is this something I should be worried about?
Germicidal ultraviolet light technology has a proven track record against indoor transmission of tuberculosis and other airborne viruses. It's now being used in some restaurants and on subways.
