 periods of world history. Did you have to do that? I remember having that memorized at one point, and that'd be another one of those that I would look back on and think, was that just an experiment in memorization, or was I supposed to hang on to that for the rest of my life? When the Pliocene era ended and the Jurassic era began, and how long... I was just going to say, I'm a Pleistocene man. Any other era is a waste of time. I don't even want to look at your bones if you're from a different era.