EditorialAn employee with a pickup order at a Subway that is testing PopID, a facial recognition system that checks workers for fevers, March 29, 2020. (Tag Christof/The New York Times)
EditorialSmart thermometers made by Kinsa. a company that has tracked the flu in the U.S. by aggregating data on fevers, in New York, Oct. 19, 2018. (Tony Cenicola/The New York Times)