The Coming Sewer Gold Rush
Environmental chemists studied Swiss sewage and found trace amounts of gold, silver and rare earth metals. It could be valuable, but chemists say it's probably not worth the cost of recovering.
Đọc thêm tại NPR
at October 12, 2017 at 04:26PM
Health & Science
Thứ Năm, 12 tháng 10, 2017
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