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.

Watch me bring a miniature steam engine to life! You won’t believe how cool this build turned out! #SteamEngine #MiniatureModels #DIYProjects #Craftsmanship #ModelBuilding $15M reward announced ...