Solid Gold
While sewers are built to collect waste, not everything that ends up there is worthless. In Japan, for example, staff at a treatment center received 5 million yen in gold in 2009. They were sifting through sludge when they found the precious metal. They were able to use the metal because of the large number of precision equipment manufacturers in the region. They discovered 1,890 grams of gold per ton of garbage!
Solid Gold
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