Skeptic » Reading Room » There is Only Entropy: Unifying the Narrative of Science
Entropy keeps the arrow of time moving; today is less ordered than yesterday, and this is certain. If we extrapolate this concept backwards, through our scientific narrative to the origins of the universe, then we must postdict a universe that was once ordered only through its lack of movement, which means it was frozen. But even then, as Galileo once said of the Earth, eppur si muove, but it does move. And if it moves, it creates heat, and understanding that creates a more coherent scientific narrative.
Source: skeptic.com