In an effort to figure out how many New Yorkers already had Covid-19, Department of Health staffers went into 99 grocery stores in different regions of the state in April and did finger pricks on 15,101 adult shoppers who volunteered to participate in the study. Those blood tests showed that 1,887 of them had antibodies to the novel coronavirus, meaning they had been infected in the past. After statistical adjustment and extrapolation [Oh boy!], the researchers estimated that more than 2 million New York adults had been infected by the end of March. That's 14% of all New York adults,...