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Our thirst for energy knows no bounds. We have learned to extract it, but we still do not know how to store it. Today, most of the energy is spent immediately after its production. The coming end of the oil era poses a question for humanity: how to save energy? Is it possible to conserve energy? In this video: energy storage devices - from the most ancient to the most modern. A flywheel, a battery and a supercapacitor. And you will also see an electromagnetic cannon railgun in action. #energy #howisitmade #science