 Kennedy's assassination in 1963, the 25th Amendment is passed to deal with these matters of presidential succession in the wake of an assassination or presidential debility because of the great prominence and importance of the American presidency. You know, you mentioned FDR at Yalta. That was a moment in which most of us didn't have access to that information until much later. We all saw the debate, at least everybody who wanted to see it saw it. And even if you didn't, you heard about it.