Of course there is no such thing as totally free energy in the sense that whatever device is used to harness an alternative energy source, including geothermal, solar and wind power systems - they all cost money up front for equipment and installation work. The search for clean energy is an urgent priority for the human race because even the biggest skeptic now is firmly convinced of the serious damage done to our environment by fossil fuels through their release of carbon into the atmosphere and the global warming effect. Perhaps one of the most interesting and surprising of...