Diffuse gas particles can behave in a way that contradicts a fundamental law of physicsShutterstock / North10Heat always spontaneously flows from a hotter place to a colder one so says the second law of thermodynamics. But within an extremely sparse gas, the opposite may be possible, with heat flowing from cold to hot. This finding could reveal cracks in a foundational law of physics.Given the second law [of thermodynamics] has been known for 150 years, you would imagine that if a counterexample exists, then
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