"If I took a heavy weight on the floor here and pushed it, it would slide and stop. ... So, a frictional effect seems to be irreversible. ... a frictional effect ... is the result of enormous complexity of the interaction of the block with the wood ... the jiggling of the atoms inside the wood of the block is changed into disorganized irregular wiggle-waggles of the atoms in the wood."
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Richard Feynman, (quote at 6:47 of 21:31 in video)
https://en.wikiquote.org/wiki/Entropy_(thermodynamics)
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Entropy (thermodynamics)
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