This great-looking Stirling Engine Kit, from the Maker Shed, is as majestic as a piece of art and it’ll help you understand the basics of thermodynamics. Unlike internal combustion engines, Stirling engines run on an external heat source, which can be anything from combustible fuels to geothermal or solar energy! You can try 3 different experiments: the generator, the fan, and the car. The kit includes a display stand so you can show it off as the world’s coolest desk toy after you finish the experiments.