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The grandfather of this brilliant madness was Austrian physicist Ludwig Boltzmann, whose proof that gas molecules disperse in proportion to their temperature was foundational to all that followed. Boltzmann showed that molecular movement is simply determined by probability, which results in concentrations of molecules dispersing until they reach equilibrium with their environment. If you pour a potful of boiling water into a cold bath, hot water molecules spread out until they are evenly distributed and have slightly raised the overall bath temperature. Time cannot go backward for the same reason that boiling water can’t re-form in one corner of a cold bath and the dead cannot return to life: random probability will never re-concentrate those molecules back into their original form. The branch of physics pioneered by Boltzmann was called statistical mechanics, and it explained one of the fundamental laws of nature: the Second Law of Thermodynamics, also known as entropy.
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