History is repeating its self everyday. Stubbing a toe on the same stair, even passing a street you have been on before, but there are more significant repeats, such as the fall of civilizations, or stock market crashes, or even plane crashes. If an event happens once, the odds are in favor of it happening again. Time is kind of like a spiral, sometimes on its own course, but at other times the spiral interlopes with a past event on the spiral of time, creating repeat events. All three of the greatest Mesoamerican civilizations fell, even when it seemed that they wouldn't, and for that matter couldn't, but the big fish always eats the smaller fish!