At the foot of the misty mountains a mighty ring was forged - again! For one month, the Large Hadron Collider will smash two types of particles in a single magnetic ring. So far, the LHC at CERN, near Geneva, Switzerland, has been colliding beams of identical types of particles, which are spun around the ring by a strong magnetic field. But in January it will smash protons into lead ions, in the hope of learning more about quark-gluon plasma. This is a hot soup of particles thought to make up the early universe.
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