Why does the universe tend toward disorder?

The answer

The second law of thermodynamics states that the total entropy (disorder) of an isolated system always increases over time. There are vastly more disordered arrangements of matter than ordered ones, so random processes statistically drive systems toward disorder. A broken egg never unbreaks because the probability of all its molecules spontaneously reassembling is astronomically small. Entropy explains why heat flows from hot to cold, why ice melts at room temperature, and ultimately why time appears to move in only one direction.