Why is the LHC 27 kilometers in circumference?

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Author's Note: Why is the LHC 27 kilometers in circumference?

Sure, it's kind of off-topic, but I think we all want to know: What would happen if we stumbled into the LHC while the proton beams were working their magic? Nobody's entirely sure, but it's a pretty good guess that you'd have a hole blasted through your body, and perhaps a cone of proton-exploding impact, as well.

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