On November 21, 1918, an Indianapolis schoolteacher named Hildreth Heiney wrote to her deployed fiancé, Sergeant Kleber Hadley, about the sudden appearance of face masks in response to the global influenza pandemic. “Yes, I wore one, and so did everybody else,” she wrote cheerfully. “There were all kinds—large and small—thick and thin, some embroidered and one cat-stitched around the edge.” An order to wear masks in public had just taken effect in Indiana, and Heiney seemed to take it in stride. “O, this is a great old world!” she went…
