Atom smasher up and running again
Updated on 20 November 2009
Scientists have switched on the world's largest atom smasher for the first time since the £6bn machine suffered a spectacular failure more than a year ago.
It has taken a year of repairs for beams of protons to once again be circulated in the Large Hadron Collider, which had been heavily damaged by a simple electrical fault.
The European Organisation for Nuclear Research has taken the restart of the collider step by step to avoid further setbacks as it moves towards new scientific experiments - probably starting in January - regarding the make-up of matter and the universe.
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