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  History of Siege Weapons
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  In this activity (page 10 of the PDF) learners will explore the historical progression of siege weapons to gain an understanding of how the addition and modification of parts can change the efficiency
  MarsBound!: Mission to the Red Planet
Source Institutions
    
  MarsBound! is an engineering simulation activity in which learners use realistic techniques to plan a mission to Mars.
  
Community Wind Project
Source Institutions
    
  In this thought-provoking activity, learners plan a hypothetical project to build and operate wind turbines in their community.