Large Hadron Collider (LHC) at Cern is back on
The LHC has been built to help physicists answer fundamental questions in physics concerning the basic laws governing the interactions and forces among the elementary objects and the deep structure of space and time.
The LHC has been offline since September 2008, following a large helium leak that Cern said was probably caused by faulty electrical connections between two of the accelerator's magnets.
>> See also: Photos: CERN - A tour of the large hadron collider
