The Large Hadron Collider (LHC) is the world's largest and highest-energy particle accelerator intended to collide opposing particle beams of either protons at an energy of 7 TeV per particle or lead nuclei at an energy of 574 TeV per nucleus. It lies in a tunnel 27 kilometres (17 mi) in circumference, as much as 175 metres (570 ft) beneath the Franco-Swiss border near Geneva, Switzerland. (Wikipedia)
elaborate.
http://en.wikipedia.org/wiki/Large_Hadron_Collider
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