Is the Coronavirus Getting Better at Airborne Transmission? - The New York Times

Is the Coronavirus Getting Better at Airborne Transmission? - The New York Times: Newer variants of the coronavirus like Alpha and Delta are highly contagious, infecting far more people than the original virus. Two new studies offer a possible explanation: The virus is evolving to spread more efficiently through air. The realization that the coronavirus is airborne indoors transformed efforts to contain the pandemic last year, igniting fiery debates about masks, social distancing and ventilation in public spaces.

This explains a lot.  Maybe I can get my vaccinated friends to mask up.