Last Friday, in a bathroom at the Newark airport, I encountered a phrase I hadn’t seen in a long time: Stop the spread. It accompanied an automatic hand-sanitizing station, which groaned weakly when I passed my hand beneath it, dispensing nothing. Presumably set up in the early pandemic, the sign and dispenser had long ago become relics. Basically everyone seemed to ignore them. Elsewhere in the terminal, I spotted prompts to maintain a safe distance and reduce overcrowding, while maskless passengers sat elbow-to-elbow in waiting areas and mobbed the gates. Beginning in 2020, COVID signage and equipment were everywhere. Stickers indicated how to stand six feet apart. Arrows on the grocery-store floor directed shopping-cart traffic. Plastic barriers enforced distancing. Masks required signs dotted store windows, before they were eventually replaced by softer pronouncements such as masks recommended and masks welcome. Such messages—some more helpful than others—became an unavoidable part of navigating pandemic life. Four years later, the coronavirus has not disappeared—but the health measures are gone, and so is most daily concern about the pandemic. …