We asked Aicher, author of "Guide to the Aqueducts of Ancient Rome," about the Romans' sophisticated water distribution system, including its elegant aqueducts. Here's what he told us: NOVA ...

Presents a survey of the rise of ancient Rome in the eighth century B.C. to its fall in the ... Emphasizes the development of democracy in Athens. Readings are in the primary sources. All ancient ...

Unfortunately for the Romans, however, these tariffs often led to higher prices, black markets and other economic problems.

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AICHER: The aqueducts were largely a gravity system ... I'd follow the ancient sources. They praise some water sources; others they really panned. Focusing on Rome, which I know best, there ...