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The Gas Cap is a project that I almost overlooked when it was first published, but have since come to love. In a nutshell, it is a hat with a built-in LED fart-meter. If that were not great in its own right, what is amazing about the project is that it is entirely made by a 12 year old boy. This kid has been on a roll making Instructables that are more awesome than many things made by people twice his age. If this project is any indication of things to come, I look forward to seeing a myriad of amazing future inventions.