Why does entropy increases?

Any closed system disorder, or entropy, increases with time. Why? In “a brief history of time” Steven Hawking gives the following explanation: Consider the pieces of a puzzle. There is one and only one arrangement where the pieces make a complete picture. On the other hand, there are many arrangements, in which the pieces are disordered and don’t make a picture. Similarly, the second law of thermodynamics results from the fact that they are many more disordered states than there are ordered ones. Without external energy or information which may reconstruct the puzzle, the system will evoluate toward the more probable state of complete disorder and meaningless set of pieces.
source: Entropy See also XlnkS535

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