The past is different from the future. Why?
It's nothing specially mysterious about a glass of water. If our expectation from the universe is like a glass of water, it's very nicely. And there's nothing surprising about watching a drop of ink dropping in to the water and disappearing from the cloud of color to a hue. It's the way we expect things to go. If we drop that drop 1000 or 1000000 we don't expect the same thing happens but the same thing happen.