Cannon roundup — EMP cannon, Shock cannon, Vortex cannon

* “EMP cannon”:http://www.physorg.com/news183296601.html. Mount one of these babies on your trunk and eliminate that tailgating problem.
* “Shock Cannon”:http://www.physorg.com/news183142646.html and here is how to get that solicitor off your porch.
* “Vortex Cannon video”:http://blog.makezine.com/archive/2009/07/gas-powered_vortex_cannon_as_big_ba.html?CMP=OTC-0D6B48984890. Probably a bit more powerful than I ever thought about building at Halloween.

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