DEVICES

Ever wondered how that thing works? Explore the inner workings of many common devices and inventions, as well as those that aren't so common, such as compasses, gyroscopes and bug zappers.
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How the Metric System Works

Ever heard of a little unit called a femtometer? Can you tell us how much you weigh -- in petagrams? We know you can't, so hurry up and start reading. We have work to do.

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