I’m a face-toucher in any season — I cup my chin when I’m thinking, I wipe my eyes, I rub my nose — but it’s only now, in the rat-a-tat-tat of coronavirus warnings that I’ve become self-conscious about it. At least I’m in good company, which I know because on Friday I saw a CNN video clip of former Vice President Joe Biden talking about the virus. Twice, within a minute or so, he brushed the area above his lip with a forefinger, first the right forefinger, then the left. His rhetoric was good, but his body language called for instant quarantine.