He looked at which American baseball teams won the World Series in particular years, compared this with the ages of their adult fans and found that higher production of fans corresponded to the team winning when the men in question were between the ages of eight and 12. As he put it: “The odds of being captured as a perma-fan peak with those aged eight to 12 at the time of the championship.” Like little ducklings, the boys “imprint” on the team and never quite shake off the feeling. If it happens this way with sports teams, just imagine what...