Drops of Enegy

Why insert the plug? Everything is energy so energy is everywhewere. Light and heat are only some common examples  that electronic systems use as supply but in nature all creatures to survive harvest energy in many ways.

Nowadays harvest energy is very difficult and only in some cases we are able to extract it.

It's how extract a drop of oil from olive but, in the end, drop after drop we will fill a bottle, like the raindrops fills a lake..

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