And mathematically, the most probable case is the case when we have three molecules on this side and three molecules on the other side. This is the state that has the highest entropy because it's the most probable state. And notice in this case we have three units of energy on this side because we have three molecules and we have three units of energy on the other side. And so what happened is, in this case, all that energy was localized on the left side, but now the energy has equally dispersed so that we have an equal amount of energy on this side and an equal amount of energy on this side. So basically what the second law of thermodynamics tells us is when energy is given the chance to, it will disperse throughout all the space in which it actually exists. And what we can say is, we can say that energy always travels from a high amount to a low amount.