“Greatest” is always debatable, but over the many re-runs, Seinfeld seems to be the most enduring sitcom. It has stood the test of time (proven by the many re-runs) and always retains its freshness when viewers watch it again and again. The simple answer as to why and how of it is this - “Nothing”. The show doesn’t hinge on a charisma of a central character (like in TBBT) or relationships between characters (“Friends”) or a well-defined setting (“The office”). The episodes in themselves don’t depend on a great story (which keeps you interested) – the events are mostly the...