Biến mồ hôi thành nước uống
Cập nhật: 14:13 29/07/2013 GMT+7
Hiện trên thế giới có khoảng 125 triệu trẻ em không có nước sạch để uống và có hàng ngàn người chết mỗi ngày cũng vì thiếu nước.
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