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Collider tunnel at CERN's Large Hadron Collider. This goes around in circle for about 17 miles.... the beam pipe on the right is surrounded by superconducting liquid-helium-cooled magnets. Protons in the pipe will reach 99.999% of the speed of light. Or so I'm told.

 

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Uploaded on August 11, 2007
Taken on July 18, 2007