Scientists Want to Mine Our Poop for Gold
Every year, Americans are flushing a fortune down the toilet. Literally. More than 7 million tons of biosolids—treated sewage sludge—pass through US wastewater facilities annually. Contained within our shit are surprisingly large quantities of silver, gold, and platinum. But our days of wasting human waste may be numbered, if Kathleen Smith of the US Geological Survey has anything to say about it. She’s leading a new research program that’s examining the feasibility of...