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Mini Cannon


(YouTube Link)


YouTube user 43287633 made a tiny functional cannon. It fires a little steel ball. The cannon is pretty effective, demolishing light bulbs, glasses, and punching holes through soda cans.

via Geekosystem

Oh great. I'm sure the airline industry will find some way to freak out about this.
Anything tube-like will be banned or something.
No pens for you!
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