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In sub-Saharan Africa, more than two-thirds of the population lives without a power grid. This lack of power energy seriously limits children's educational opportunities, so they need an environment where they can study until evening without worrying about light. So I thought about a solution that can use daytime rides as power energy in the evening. This yo-yo is a ride for children and serves as lighting at the same time. The principle of energy harvesting is that electrical energy can be accumulated by using the friction that occurs when yo-yo rotates and can study late at night.
Gyeonggi, South Korea
Woo Ga Yeong,