Four years after hospitals in New York City overflowed with covid-19 patients, emergency physician Sonya Stokes remains shaken by how unprepared and misguided the American health system was. Hospital leadership instructed health workers to forgo protective N95 masks in the early months of 2020, as covid cases mounted. “We were watching patients die,” Stokes said, “and being told we didn’t need a high level of protection from people who were not taking these risks.” Droves of front-line workers fell sick as they tried to save lives without proper face masks and other protective measures. More t…