My holiday experience probably resembled that of many others: waiting in line at the airport, listening to the hacks of people coughing all around me, mostly unmasked. The cognitive dissonance feels hard to overstate. We are still officially in a pandemic, even now, four years since the novel coronavirus first emerged. We know that Covid-19 is airborne and that wearing a mask is the most effective way to prevent airborne particles from being transmitted. We know that 1,600 people a week are curr