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14-year-old Jia Mingxuan builds tree-saving device that wins gold in Germany

September 25, 2026 ha ha

14-year-old Jia Mingxuan builds tree-saving device that wins gold in Germany

14-year-old Jia Mingxuan builds tree-saving device that wins gold in Germany

Reviewed by karthi on September 25, 2026 Rating: 5

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