Large Hadron Collider turned back on
Scientists are in the process of restarting the Large Hadron Collider, the most powerful atom-smasher ever built, hoping to make history for the second time in two years.
The first of two high energy particle beams is being “threaded” in an anti-clockwise direction through the LHC’s 27 kilometres (16.7 miles) of circular underground tunnels.
