Many of us have read about Stirling engines, engines which form mechanical heat pumps and derive motion from the expansion and contraction of a body of air. A very few readers may have built one ...

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In 1816, engineer Robert Stirling invented his proprietary Stirling engine, an automatic power source operated by ambient heat rather than direct fuel sources like an internal combustion engine.

A tiny Stirling engine is one of the coolest desk toys you can have. Since it requires nothing more than a difference in temperature to get going, you can just throw it on your laptop ...