Cern has restarted the Large Hadron Collider after a two-year break, increasing the energy of its collisions to almost twice the level previously achieved.
Since 5 April, the LHC has fired particle beams at energies of 13 TeV, almost twice the 7 TeV it reached when it was first tested in 2008.
The 27-kilometre accelerator was meant to restart on mid March, but electrical problems postponed the event.
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