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The Arrow of Time and the Second Law of the Universe
The entropy of the universe has steadily increased as our universe is expanded and cool. That means that if our universe is to be in the state we find it in today, it must have been in a very, very low entropy state in the Big Bang. And we don't know how or why it wound up in such an unlikely state. It's kind of like saying that our universes dice were all facing one shortly after the Big bang. We don't know what physical mechanism might have led to that.