The second law of thermodynamics - the law that entropy must, on average, increase - has been interpreted as the inevitability of the decay of structure. This is .... misleading. Structure can develop in one region even as the entropy of the universe rises. Ultimately, entropy is a measure of the availability of free energy - of energy that isn't hopelessly mixed in thermal equilibrium.

Originally released by Knowledgemotion, 2018. Streaming video file encoded with permission for digital streaming by Infobase on February 21, 2020.

Reversing Entropy with Maxwell's Demon (11:35); .