The $29.99 all-metal desktop Stirling engine kit is one of the simplest. It can be assembled in 15 minutes and is recommended for ages 14 and up. Also for $29.99 is the Exploring Kid Steam Engine Kit.

For those aspiring to make the move from car enthusiast to master mechanic, online retailers like Amazon are full of listings ...

If you love the sounds and smells of an internal combustion engine but don't want to get a car to experience one, you could buy a mini engine kit and build a scaled-down example as the main feature of ...

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