As fears of a coronavirus pandemic sweep across the nation, Americans have been buying up face masks, hand sanitizer and oat milk at skyrocketing rates. Sales for medical face masks in the U.S. jumped 319% in the four-week period that ended on Feb. 22, according to data from the consumer research firm Nielsen. Household maintenance masks sales were similarly up 262% in that same period. Hand sanitizer sales spiked 73%, though Nielsen predicts that the demand for sanitizer hasn't even begun to peak. Sales of thermometers were up by 47%, and aerosol disinfectant purchases climbed 32%. The data also indicated...