Paul Westerhoff of Arizona State University has shown that a community of one million people produces precious metals worth up to US$13 million a year in its sewage. So how do they get there... and how do we get them out?!
Paul Westerhoff of Arizona State University has shown that a community of one million people produces precious metals worth up to US$13 million a year in its sewage. So how do they get there... and how do we get them out?!