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Top 20 Directory:
Top : Kids_and_Teens : School_Time : Science : Technology : Machines
  		• Aircraft
  		• Bicycles@
  		• Boats
  		• Cars and Trucks
  		• Robots
    Sites:
  		• Animated Engines: Animated pictures explain the inner workings of a variety of steam, stirling, and internal combustion engines.
  		• Simple Machines: Gives real-life examples of the six simple machines, plus an easy quiz, and links.
  		• Simple Machines: Explains simple machines such as levers, gears and pulleys with text, pictures and animations.
  		• Simple Machines: Games challenge you to identify different types of simple machines.
  		• Simple Machines Learning Site: An overview of the six basic types of simple machines with pictures and student drawings.
  		• The Secret Life Of Machines: Drawings and explanations to common machines and how they work.
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