That's what the U.S. researchers are investigating right now for ways of extracting all of them. Rare earth metals are also found in our poos such as palladium and vanadium which are very important metals used in some industries in the world today. Palladium is a rare and lustrous silvery-white metal used in catalytic converters. It is also used in jewelry, dentistry, watch making, blood sugar test strips, aircraft spark plugs and in the production of surgical instruments and electrical contacts. More of its applications http://en.wikipedia.org/wiki/Palladium. And Vanadium is a hard, silvery gray, ductile and malleable transition metal used as ferrovanadium or as a steel additive. For more of its applications, visit http://en.wikipedia.org/wiki/Vanadium. There is another team of scientist who calculated that the amount of metals that can be extracted from the waste of a million Americans could yield as much as $13 million. Amazing! Even though human wastes are disgusting, foul smelling, gross and so on, they are no wastes at all. Who would have thought that they contain gold and silver and other precious metals? Just like garbage that contains a lot of junks that can be sold and can be a source of income for a lot of people, human wastes now could be too. It's only a matter of time before we have the technology to extract those gold, silver and precious metals right in our very own backyard. Sounds exciting!
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