On various occasions when writing previously I’ve recounted a joke about a man who believes himself to be a grain of seed and is taken to a mental institution where the doctors do their best to convince him that he is not a seed but a human being. When they eventually succeed, he is allowed to leave the hospital. But he then returns immediately, trembling with fear. He reports that there is a chicken outside the entrance and he is terrified (...) that it will eat him. “Dear fellow,” says his doctor, “you know very well that you are not a seed but a man.” “Of course, I know that,” replies the patient, “but does the chicken know it?” My Croat friend Dejan Kršić recently sent me a corona-version of this joke: “Hello, my friend!” “O, hello, professor! Why are you wearing a mask? Two weeks ago you were explaining all around that masks don’t protect against the virus?” “Yes, I know they don’t work, but does the virus know it?”. (shrink)