oken of matter and energy, and the structure of the universe has become increasingly complex.

Hawking's explanation is that the entropy reduction comes from outside the system and cannot come from inside. But if this is the case, then the universe as a system can only increase the entropy, it is impossible to reduce the entropy, and the universe must move toward the most balanced state. If you say that in some places entropy decreases, while in some other places, the entropy increases, but after the Big Bang, the universe has been reached the maximum entropy, it is completely uniform, and how can it increase.

If there is a container, which is divided into two parts, A and B. There are some hot gases on the left and some low temperature gases with the same composition on the right. After a while, the high-temperature gas transfers heat to the low-temperature gas, and the temperature on the two sides tend to be the same. This change belongs to the increase of entropy, which is consistent with the second law of thermodynamics. Heat transfer from a low temperature object to a high temperature object is an entropy reduction. How can this system reduce entropy?

In order to solve this problem, Maxwell invented a goblin called Maxwell demon. He said that this little goblin is very clever, it can track the whereabouts of each molecule, and can identify their respective speed. Molecules in an air-filled container with a uniform temperature have non-uniform rate of motion, but the average velocity of molecules is uniform. Now suppose there is a small hole in the container boundary, and then imagine that Maxwell's demon can open or close that hole so that fast molecules run from A to B, while slow molecules run from B to A. In this way, without power consumption, the temperature of B increases, the temperature of A decreases, and there is a contradiction with the second law of thermodynamics. So symmetry breaking occurs, and as the entropy decreases, the world can evolve now.

Is Maxwell's demon