What we don’t know about physics

See:

http://www.project-syndicate.org/commentary/rothman1/English

Opinion reads: Yet friction produces heat and thus an increase in entropy – which measures the amount of energy that cannot be used to perform work – and it therefore distinguishes past from future. The increase in entropy – the second law of thermodynamics – is the only law of nature that makes this fundamental distinction. If Newtonian mechanics is at the bottom of everything, then one should be able to derive the second law of thermodynamics from Newtonian physics. But this has never been accomplished satisfactorily: the incompatibility of the second law with the other fundamental laws is perhaps the greatest paradox in all of physics.

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