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The Second Law of Thermodynamics
The second law of thermodynamics is a principle of physics that says things tend to get more random over time. People first paid attention to this back in the 1820s, when steam engines were a big thing. It was an idea that mechanical energy tends to get dissipated as heat and you end up going from sort of systematic motion to this kind of random thing. And then that quickly becamesort of a global principle about how things work.