Photo: Youtube You Can Use the Sun as a Source of Heat Stirling engines are a type of heat engine. They convert heat into mechanical work (you can find out more about how they work here ), which means that it is possible to use the sun as a source of heat to general clean power. The video below shows a working stirling engine build out of soda cans that spins up to almost a thousand RPM!… Read the full story on TreeHugger
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Stirling Engine Made with Soda Cans Spins to 860 RPM (Video)