Phát minh giấy dùng được 500 lần
Cập nhật: 15:20 13/06/2008 GMT+7
Một học sinh cấp 2 người Trung Quốc đã phát minh ra một loại giấy rất tiết kiệm có thể dùng đi dùng lại khoảng 500 lần.
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