Aerial view of the Relativistic Heavy Ion Collider (RHIC) accelerator complex at Brookhaven National Laboratory on Long Island. The facility will generate two counter-circulating, high-energy beams of heavy (for example, gold) nuclei; these beams will intersect and collide in six interaction regions located uniformly around the rings. The insert shows a recent photo of the tunnel that houses the accelerator, with an array of powerful superconducting magnets needed to bend the high-energy beams. (Courtesy RHIC.)

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