70
edits
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* building a large wooden trebuchet | * building a large wooden trebuchet | ||
* | * building a model rocket | ||
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* build an orrery | * build an orrery | ||
* make black powder for a model rocket | * make black powder for a model rocket | ||
* build a steam engine and/or Stirling engine | * build a steam engine and/or Stirling engine | ||
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* cast wax and tin alloys | * cast wax and tin alloys | ||
* fire pottery | * fire pottery | ||
* arc-weld |