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.

Đọc tiếp trên NPR
October 12, 2017 at 12:42AM
Environment