If a dog wants to know who another dog is, we just smell them. We do the same with humans. If a human wants to know who a dog is, she or he just check the dog’s registration on the chip of the dog, with an electric chip reader.
If a human wants to know who another human is, the other human has to show an identification card. This is much more troublesome, as far as I can say. Identification cards come in different forms. They are valid just for a few years and a human has to remember to bring a valid card to make sure others can be sure the human is whom she claims she is.
Paula went to get a new identification card today. Humans need to do this once in a while.
It would be easier for humans, if they could just identify each other on their smell, like dogs do.