Stirling engine kit runs from heat of your hand

The principle of the Stirling engine is simple but ingenious. An external heat source and heat sink create temperature differences in a cylinder. The air inside expands and contracts because of these differences and thus moves a piston. The piston is typically attached to a crank shaft to convert the reciprocating motion into a rotary motion.

This Stirling Engine Kit can run on the heat coming from your hand alone! This would make a pretty cool gift IMHO.

Here is the link for this Stirling Engine Kit.

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