In mid-March, in response to the unfolding Covid-19 pandemic, MIT Medical quickly set up testing tents where essential workers and others who remained on campus could be safely screened for the novel coronavirus. In the tents, nurses and physicians administered nasal swabs while dressed in full personal protective equipment, or PPE. It soon became clear that to safely test on a daily basis, medical workers needed to regularly replenish their PPE — a resource in short, desperate supply. There was also the possibility that, in doffing all that PPE at…