What is entropy?
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In science class you may have learned that energy can not be created or destroyed, which is true. However, each time you change from one form of energy to another it becomes less organized and less usable.
For example food is a highly organized form of stored energy that I can easily use. Eventually I will use some of that energy to speak. Noise is a highly disorganized form of energy that is not really reusable, not easily anyway.
Eventually all this energy turns into heat, which basicly dissipates into the universe as background.
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