The world's smallest working heat engine

Plazma Inferno! said:
A team of German physicists has just built the smallest working heat engine. It uses a single Calcium atom, and runs in four strokes like your car's combustion engine. It is about as efficient as your car at transforming the changing temperature into mechanical energy.
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It does not, of course, change "temperature" into mechanical energy - it uses a difference in temperature, and the resulting heat flow, to convert heat energy to mechanical.
 
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