A fatal misstep took place around 200 B.C. Roman engineers used lead piping to replace the system already in place. This dramatically improved the way that water was carried into the city. Unbeknownst to the Romans, however, lead piping contained toxins that got into the water, causing numer...
The Romans built great“aqueducts”to carry fresh water from the mountains to the cities. Many of these aqueducts are still standing today. The Romans also built great pipes under the ground to carry away the sewage(污水). In Rome, one of these sewage pipes is still used today: it is 2...
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