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  1. Backyard Ballistics by William Gurstelle

    The Book that tells you how to build potato cannons, paper match rockets, Cincinnati fire kites, tennis ball mortars, and more dynamite devices.
    science fair1
    science projects1
    physics experiments1
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    backyard ballistics1
    anarchists handbook0
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    William Gurstelle0

    www.backyard-ballistics.com - 2009-02-12

science fair1 potato gun1 science3 potato launchers1 potato launcher1 science experiments1 chemistry2 physics2 biology2 potato cannon1 science project1

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