I was at a guest house with a comrade, and that two-year-old daughter is enthusiastically sucking the tip of the dog's tail. Okay I ask?

Yes, he says, let the immune system develop.

You might think that the father is a pofigist, but then there was a lecture about acquired immunity and somatic hypermutation of antibodies. Dad is a doctor of biological sciences, and has written a bunch of papers on genetics.

However, at one time he struck me that he picked up the sausage that fell on the pearl and ate it. But we were on a trip, and there every grain is a vitamin. After the trip, I learned to do that too.