Oct. 19, 2009 - Romans not only gave us the modern drainage system, they were also the first to use this "green" method to heat their homes.

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Story Published: Oct 19, 2009 at 3:00 PM PST

Story Updated: Oct 19, 2009 at 10:38 AM PST

By KATU News Producers

Answer: Geothermal Energy.  The ancient Romans used hot springs to heat baths and homes, and similar uses are still found in some geothermal regions of the world, such as Iceland, Turkey, and Japan.

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