"Hostess" is a science fiction short story by American writer Isaac Asimov. It was first published in the May 1951 issue of Galaxy Science Fiction and reprinted in the 1969 collection Nightfall and Other Stories and Robot Dreams. The story involves an alien medical doctor who visits Earth as part of research into the unique fact that only Earth beings age and die. His idea of why this happens is proven true in an unexpected way. Source: Wikipedia (en)