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Cover: The 4000-ton PHENIX detector is one of four particle detectors at Brookhaven National Laboratory's Relativistic Heavy Ion Collider, which brings countercirculating beams of ultrarelativistic nuclei into collision. In the foreground, the missile-shaped yoke of a spectrometer magnet surrounds RHIC's beam pipes. The blue wings emerging left and right from PHENIX's collision region house tracking chambers, counters, and calorimeters. The article beginning on page 48 discusses what has been learned from early experiments at RHIC.
