The Large Hadron Collider (LHC) has produced...

CERN Director General Rolf Heuer said Monday: "It"s a great achievement to have come this far in so short a time. But we need to keep a sense of perspective — there"s still much to do before we can start the LHC physics program."

On Monday beams of protons started circulating in both directions around the LHC. In the next few days, the two beams, brought together to stage small collisions, will lay the groundwork for high-energy collisions that are expected to take place in January.

On Friday, the first circulating beam of protons successfully made it through the LHC"s entirety.

Experiments using the LHC were suspended last September shortly after a successful start, due to a malfunction of two superconducting magnets and a subsequent helium leak into the tunnel housing the device.

The collider, located 100 meters (328 ft) under the French-Swiss border with a circumference of 27 km (17 miles), enables scientists to shoot subatomic particles round

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