Sewers: The Untapped Renewable Energy Source http://www.scienceray.com/Physics/Sewers-The-Untapped-Renewable-Energy-Source.160807 Discussion about: Sewers: The Untapped Renewable Energy Source Jay http://www.scienceray.com/Physics/Sewers-The-Untapped-Renewable-Energy-Source.160807#comment238969 ]]> Wed, 13 Aug 2008 14:52:17 PST Hein Marais http://www.scienceray.com/Physics/Sewers-The-Untapped-Renewable-Energy-Source.160807#comment194949 ]]> Tue, 08 Jul 2008 07:05:36 PST