Vietnamese teenagers hoping to clean air with bicycle invention

(L-R front) Cao Thi Khanh Hoa, Tung Bao Khanh and Tran Hoang Phi Bao alongside their professor Le Thanh Hai (back L), at Thang Long institute in Dalat, southern Vietnam, Apr. 26, 2019. EFE/Khang Nguon …
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