Microscopic Stirling Engine

[Mr. Boltneck]

http://www.sciencedaily.com/releases/2011/12/111211134002.htm

This at least demonstrates the principle of the thing. Actually building running engines, not to mention the swarm of microscopic heat-harvesting robots with which to take over the world, may be a bit trickier. Still, it's nice to know that the physics is still sound at that scale.