Its really quite simple.

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After a few weeks of giving this thing a go, I can say that it really does make good on its simple promise: It charges your phone (there are different versions for the iPhone 5, older iPhones, and micro-USB-charged phones), and does so without taking up much space.

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But what really accounts for its success is not the relatively simple transport of data packets.

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It's not really that simple, but there's no denying that incumbency has its advantages in a re-election campaign, as this week's "How it Works" explains.

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On its face, it's a simple photo uploader -- but it's more than that, really.

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