Arrows, Xs and masks will certainly be the most memorable symbols of the COVID-19 pandemic for me, but so will these little official-looking squares found in many disposable mask packages. 65%, 35%, 85%…better wear two.

Arrows, Xs and masks will certainly be the most memorable symbols of the COVID-19 pandemic for me, but so will these little official-looking squares found in many disposable mask packages. 65%, 35%, 85%…better wear two.