Half a croissant, on a plate, with a sign in front of it saying '50c'
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Bicycle prop

Get airplane motors and push bicycles with them
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Mounted on the back seat of a standard bicycle, this AA- battery-powered propeller would be 3 inches in diameter and provide a good quarter-ounce push.
Voice, Dec 24 2010

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       [-] lack of reckless and inadvisable use of pyrotechnics for propulsion.
8th of 7, Dec 24 2010
  

       [-] inoffensive.
MaxwellBuchanan, Dec 24 2010
  
      
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