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.