1. Science and Technology

2. From the time people began living in cities, they have faced the problem of plumbing: how to obtain clean water and remove human wastes? In most ancient cities, people retrieved water from a river or a central well. They dumped wastes into open drainage ditches or carted them out of town. Only the rich had separate bathrooms in their homes.

3. By contrast, the Indus peoples built extensive and modern-looking plumbing systems. In Mohenjo-Daro, almost every house had a private bathroom and toilet. No other civilization achieved this level of convenience until the 19 th and 20 th centuries. The toilets were neatly built of brick with a wooden seat. Pipes connected to each house carried wastewater into the undergound sewer system.

4. The ancient Romans also built sophisticated plumbing and sewage systems. Aqueducts supplied Roman cities with water. In the 17 th century, engingeers installed a series of water wheels to pump water for the fountains of versailles, the palace of the French king Louis XIV. The water was pumped from a river three miles away. This was the largest water-supply system powered by machine rather than gravity. The flush toilet was patented in 1775 by Alexander Cumming, a British mathematician and watchmaker. Pont du Gard, Roman Aqueduct in southern France. Gardens Of Versailles Fountains

5. Rome was the only ancient city that had a reliable and plentiful supply of water. By A.D. 97, approximately 1,800 years after the decline of the Indus Valley civilization, about 85 million gallons of water were supplied to the city each day through 9 aqueducts. More aqueducts were added later. In addition to Rome, another 200 cities in the Roman colonies constructed aqueducts. The aqueducts were amazing engineering feats that brought water over many miles. A few of these, including the Aqua Virgo in Rome, still provide water.