On my drive back home from work this afternoon, I was letting my thoughts ramble away as always and was struck by an interesting insight. Just came up with the idea that when my father was my age now, I was seventeen years old which is forty years ago. Doesn't seem like it was that long ago, but it was. Wouldn't it be even more interesting if forty years ago my father had had a similar insight while he was driving home? On closer inspection of my memory, I am disappointed to realize that this is not possible. My father's father died at the age of fifty years, before my father turned thirty and more than a decade before I was even born. However, it might still have been possible, if things had turned out differently.