Solid Gold
they built sewers to accumulate garbage, but not all of it is useless. Staff at a treatment center in Japan received 5 million yen in gold in 2009. When they found the precious metal, they were extracting sludge. They were able to use the metal because there were so many precision machinery makers in the region. Per ton of garbage, they discovered 1,890 grams of gold!
Solid Gold
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