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http://en.wikipedia.org/wiki/Atlatl
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For some reason, I am reminded of that great pre-agricultural invention, the throwing stick (though I am fairly sure it has some more definitive name). This was the device that amplified the utility of the spear, so that the spear flew further, faster and higher. A matter of aggregating the force available at the hand and
its launching speed capability over a longer arc and a higher launch speed with the available manpower.
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