NPR News: There's Gold In Them Thar Sewage Pipes, Swiss Researchers Say

There's Gold In Them Thar Sewage Pipes, Swiss Researchers Say
Each year, more than $3 million in gold and silver wind up in Swiss wastewater, scientists found. But in most cases it doesn't make economic sense to extract and recycle the metals.

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Làm đẹp Blog 247 October 12, 2017 at 12:42AM
Category Health & Science