Xe đạp lọc nước
Một nhóm gồm 5 sinh viên đến từ California (Mỹ) đã chế tạo thành công loại xe đạp 3 bánh (ảnh), có khả năng lọc nước hiệu quả, dành cho người dân sống tại những nước đang phát triển.
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