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

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.

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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