the real cause of the evolution of the world? Impossible, because it consumes external information even if it does not consume energy when it creates non-equilibrium. The speed of movement of molecules is a kind of information. So it is still a worldwide puzzle to explain the evolution of the world.

So is there a Maxwell demon that does not consume energy and foreign information?  Although the asymmetry of energy is not likely to occur spontaneously, the asymmetry of matter may occur spontaneously. Boltzmann tells us that the essence of energy symmetry is that the structure of matter tends to be symmetrical.

If there are two small balls A and B in two adjacent boxes and the partition in the middle of the box is removed, the symmetrical state has two possible distributions, one is A on the left with B on the right, the second is B on the left with A on the right. There is only one distribution of the two balls on the left or right side together, which is a state of symmetry broken. Therefore, the probability of occurrence of a symmetric state is large, and the probability of a symmetry broken state is small. Boltzmann defines the logarithm of this probability as entropy.

In the example above, if there are two balls in the box, they may be on one side, or they may be evenly distributed on both sides. The possibility of even distribution is big, and the possibility of being on one side is small. However, if we assume that there is an oxygen atom on each side of the box, they will certainly not be on two side and they will soon be combined into one oxygen molecule. In other words, the state with the highest probability we said is not the stable state, and the state of symmetry broken is the stable state. The state of low probability appears spontaneously, that is, the entropy decreases sponta- neously. The emergence of such symmetry broken does not consume energy nor consume external information, ie, no external input of negative entropy is required. This is a spontaneous entropy reduction process.