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”http://www.youtube.com/watch?v=EYas53pGGKg&feature=youtube_gdata”
Here is an easy to make ancient yet modern device, the Atlatl, that hurls spears at up to 100mph. Get the PDF for this project here: http://blog.makezine.com/archive/2009/10/weekend_project_the_atlatl.html. More great projects at http://www.makezine.com
