Kids build models of plastic cars. Well, we do to. But we also build cool stuff that kids aren’t allowed to touch, like this sweet working model of a double cylinder ($300). Just apply heat and boom, the principles of propulsion are nicely illustrated. Hey, it wouldn’t be an adult toy if there weren’t some education involved.
[youtube width=”640″]https://www.youtube.com/watch?v=slfmSyaRqRc[/youtube]
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