Systems in the Universe trend toward disorder, with only applied energy keeping the chaos at bay. The concept is called entropy, and examples can be found everywhere: ice melting, campfire burning, ...

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The Second Law of Thermodynamics says that entropy in the universe must always increase. It's an immutable law of physics, and it's the reason you can't get free energy or perpetual motion machines.

HOUSTON -- (May 15, 2017) -- By precisely measuring the entropy of a cerium copper gold alloy with baffling electronic properties cooled to nearly absolute zero, physicists in Germany and the United ...