DarkKnightRadick writes "According to this article on PhysOrg.com, the ancient Mayans had pressurized plumbing as early as sometime between the year 100 (when the city in question was first founded) and 800 (when it was abandoned). While the Egyptians had plumbing way earlier (around 2500BC according to this site), this is the first instance of plumbing in the New World prior to European exploration and conquering." Link to Original Source
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