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Cogs and chain

Instruction #4 - an example of human ingenuity which would otherwise go unnoticed. This was a bit of a tricky one and I can't seem to find examples of the kind of genuine, impromptu problem solving ingenuity that I'd hoped to find in response to this instruction, the kind that I've seen in other, poorer parts of the world, where ingenuity is often borne out of necessity. So instead I've opted for a clever bit of mass produced engineering, the type which I still think is pretty ingenious and is largely unnoticed - gear cogs and a bicycle chain.

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Uploaded on October 26, 2010
Taken on October 26, 2010