LHC the world's largest particle accelerator is now active

The Large Hadron Collider is reborn — on Easter weekend, of course. After shutting it down for two years in February 2013, the world's biggest and most powerful particle accelerator is up and running again. That doesn't mean that it's going at full power though, says Paul Collier, head of beams at CERN. Getting it to the acceleration needed to collect collision data — and perform actual physics experiments — is going to take two months.

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