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First, a word about Arduino and why you should care. An Arduino is what is called a "prototyping micro-controller" aka "really fun electronic gizmo toy."
Huxley and I like to make Arduino projects. If you know what that means, your geek cred is good. If not, I'll explain briefly.
Arduino is an Italian based project that produces circuit boards that are controllers.
Arduino Playground: Geeky Projects for the Experienced Maker
This is so awesome - an arduino controlled fan cart.