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well water to ice can be reversed back to water but bread to toast cant. there is also wind to electricity, trees (wood) into paper and for sand into glass. I think they can probably all be summed up in one concept: entropy. Even for processes that appear to be reversible, the truth is that whatever energy differences exist in the 'thing', it cannot be restored after being spent without the expense of more energy. The original 'thing' can never be restored in the sense of 'no net loss of energy'.

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