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@raceoff appreciated. I get your point that generating electricity is as simple as moving a coil next to a magnet. Does worth for anything? I may say yes. If the concept was not discovered by faraday along time ago, we wound no lights on our street or rural areas may not have electricity. Does the concept of generating electricity from sound have worth? As for today, it may have less worthiness; but, in the future, it may revolutionize energy generation.