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The historical Romans had many public flush bathrooms, which emptied into an extensive sewage system. The main sewer in Rome was the Cloaca Maxima; building started on it in the sixth century BCE and it is nonetheless in use at present. Continuing enhancements led to the furnace and bellows and offered, for the primary time, the ability to smelt and forge gold, copper, silver, and lead – native metals present in relatively pure form in nature. The benefits of copper instruments over stone, bone, and picket tools were quickly obvious to early humans, and native copper was in all probability…